The "how many" depends very much on the "what are they".

Something like pepperoni slices you are pretty much unrestricted. Anything with cheese you need to watch the carb count and the daily limit while on Induction. Similar with things like celery.

These are the snack I found that worked well.

Pepperoni slices.
Deviled eggs
Celery with cream cheese.

Now, once or at most twice a day, I am having a S/F jello topped with whipped cream. I don't recommend that during Induction and, once out of Induction, be sure to establish that it doesn't stall you are trigger cravings.