Sometimes you might miss the Daily Coding Challenge (DCC), Time Travel Tickets allow you to make up the missed Daily Coding Challenge. Tickets can be used to make up any missed Daily Coding Challenge within the calendar year but not for any that have passed. For example, if you missed a Daily Coding Challenge in December 2022, you can't make it up with a Time Travel Ticket as of January 1st 2023 (note: LeetCode follows UTC time).
The monthly use limit for Time Travel Tickets is 3. Each month your ticket limit resets and you'll have the ability to redeem 3 tickets on the 1st of the month. Thus, if you miss 4 Daily Coding Challenges in one month, you'll need to wait until the following month to redeem a Time Travel Ticket to recover the 4th.
At this time, Time Travel Tickets don't update the max streak on the profile heat map, only the fire logo streak.
Will I still receive my badge for the month if I have to use a Time Travel Ticket to recover a missed DCC?
If you use Time Travel Tickets to recover a missed Daily Coding Challenge, you will still be able to receive the badge for any months you've completed.
Do Time Travel Tickets update the heat map on my profile?
At this time, Time Travel Tickets don't update the max streak on the profile heat map, only the fire logo (DCC) streak.