Is there any tolerance period for delays?

It depends.

Some bus companies may wait a few minutes of tolerance after boarding time.
But this is not a rule, and companies may also choose to start the trip on time.

In any case, it's better not to risk it!

But if you realize you won't arrive on time, we recommend contacting the bus company to see if they can wait for your arrival. If they can't, it's best to try rescheduling directly with the bus company if that's an alternative.

Also visit: I missed the boarding. What can I do?