Can a puppy lick a toppl too long?

Toppl users – how long do you let your puppy work at one?

I recently got my four month old mix a toppl. Is there a time limit for these things? Like is it ok for her to sit there and lick at this for an hour or more? I see some people say they feed their animals their dinner in them and I just wanted to make sure it wasn’t harmful to give her one that could take her a while to finish. We were going to feed her frozen dinner in one tomorrow for the first time.

Any time I’ve tried to google I haven’t really found an answer.