Learn · Calendar explainer

How to Share Your Availability

Instead of asking when someone is free, offer a few times that genuinely work for you. Include the date, length and time zone so they can answer with a choice.

The lesson

Instead of asking when someone is free, offer a few times that genuinely work for you. Include the date, length and time zone so they can answer with a choice.

Why scheduling messages go back and forth

Coffee next week? When are you free? That friendly question gives the other person a search task: inspect their week, guess what might suit you and send something back. You then repeat the search on your own calendar. If the suggested time fails, another exchange begins.

The wait between replies is part of the cost. In Kooti and colleagues' 2015 study of Yahoo email, the median reply time in the two-person reply analysis was 47 minutes. That describes messages that received replies, not unanswered mail, and it is not a measured delay for text messages or your particular friends. It illustrates why an extra exchange can matter.

Offer specific times in your first message

Try an offer instead of an open question. For example: Here are some times that work for me for a 30-minute coffee. Then give three options with dates and a time zone. If one works, the other person can settle the choice with a single reply.

  • Tuesday, November 3, 2026: 4:00–4:30 PM.
  • Wednesday, November 4, 2026: 3:30–4:00 PM.
  • Thursday, November 5, 2026: 9:30–10:00 AM.
  • All times: Central Standard Time (America/Chicago).

These are illustrative options, not a formula that guarantees acceptance. The useful change is that your recipient can assess complete proposals instead of having to guess which day, hour and meeting length you mean.

A blank slot is only the start of the check

Check personal commitments as well as work meetings. Then check the time around the proposed meeting. If a meeting ends at 3:00 and the café is 20 minutes away, a 3:00 coffee is not workable even though the calendar looks empty from that point onward.

Put travel before the coffee, where it belongs. With a 20-minute before-buffer and options on a 15-minute grid, 3:15 still overlaps the preceding meeting once the buffer is included; 3:30 is the first fitting option in this example. A buffer after the coffee would not solve the trip there.

Name the time zone. Three o'clock in Denver and three o'clock in Chicago are different moments. Sharing a start and end time with a zone gives the recipient enough information to interpret the offer.

Key idea

Share the gaps that work, with their constraints. You don't need to send the appointment details surrounding them.

The rule

  1. Offer a few specific dates and time ranges, including the time zone.
  2. Check relevant calendars and allow time before and after the meeting where needed.
  3. After someone picks a proposal, add the agreed meeting to your calendar.
Transcript

Video transcript

Read the full transcript

You email a friend. "Coffee next week? When are you free?" Six messages later, it's Thursday, and there's still no coffee. The problem isn't your friend. It's the question. "When are you free?" might be the slowest question in scheduling.

Engineers call each there-and-back a round trip. Nothing can happen until the reply arrives, so every round trip adds a wait. And the waits are real. In a study of Yahoo email, half the replies between two people took forty-seven minutes or more. That's only counting the ones that got answered.

"Tuesday?" "Can't. Wednesday?" "Afternoon?" "Three?" "Can we do four?" Every extra exchange adds another wait.

An open question hands your friend a job: search their week, guess what suits you, send something back. Then you search yours. So flip it. Don't ask when they're free. Tell them when you are. Offer three specific times. If one works, a single reply settles it: "Wednesday."

But the times you offer have to really work. Check every calendar, not just your work one. And leave room to get there. Wednesday at three looks free, but your meeting ends at three, and the café is twenty minutes away. Name your time zone, too. "Three o'clock" means two different things in Denver and Chicago. And notice what you didn't send: your calendar. Just the gaps.

InstaCal's Share Availability does that checking for you. Set each calendar. "Must be free" rules out any time it clashes with. "Prefer free" keeps those times, ranked lower, with a warning. "Ignore" leaves it out. Choose your hours, the meeting length, and a travel buffer.

Pick a few of the times it finds, and share them as text, an image, a PDF or a calendar file, with your time zone at the end. Your friend picks one, and you add it to your calendar. It doesn't publish your calendar or run a booking page. Already have one? Add your link.

InstaCal. One purchase for Mac, iPhone, iPad and Apple Watch. No subscription. Stop asking. Start offering.

Want more calendar tricks, explained? Pick your next video, and subscribe so you catch the next one.

Where InstaCal comes in

Find and share proposals in InstaCal

Share Availability on Mac, iPhone and iPad lets you assign each calendar a role. Must be free excludes conflicting slots. Prefer free keeps them, ranks them lower and shows a warning. Ignore leaves the calendar out. Busy, non-declined events are the events that block time.

Choose a date range, meeting lengths, available hours and before/after buffers, then select Find Available Times. Buffers default to zero, so set one when the meeting requires travel. Pick the proposals you want and share them as text, an image, a PDF or an .ics calendar file. The text includes your time zone.

These are proposals. Your friend chooses one and you add the meeting. InstaCal does not publish your calendar, host a booking page or automatically book the chosen slot. If you already use a booking page, you can include its link.

FAQ

Common questions

What should I include when sharing availability?
Give specific dates, start and end times, and your time zone. Check all relevant calendars and include time to travel or transition before offering the slots.
Does Prefer free exclude conflicting times?
No. In InstaCal, Prefer free keeps those slots but ranks them lower and flags the conflicts. Choose Must be free for a calendar whose conflicts must rule out a slot.
Does sending an .ics proposal reserve the time?
No. InstaCal exports availability proposals as tentative and transparent. They are suggestions rather than busy bookings; add the agreed meeting after the reply.
Do I have to make my calendar public?
No. Share Availability sends your selected times as text, an image, a PDF or a calendar file. It does not publish a calendar or run a scheduling server.
InstaCal app icon

Stop asking. Start offering.

One $19.99 purchase for Mac, iPhone, iPad and Apple Watch. No subscription.

$29.99 $19.99 once. One purchase includes InstaCal for Mac, iPhone, iPad and Apple Watch. No subscription, InstaCal account or ads.