How to Track time for table from open ticket to settle

How to track the time when we open the ticket until we settle and then calculate it depend on any rate …
I have extra services for my restaurant. My service is about KID play. Guest come in and they can let their kid play at my KID centre but i need to charge by time amount of play

There is product timers you could use for something like this.

I think ticket/entity state time reportting is a v5 feature but might be wrong on that… never used myself yet.

hello thank you your clue. But i try to search and find the way to config it my problem is that i want to show it on ticket invoice when print bill to customer . How to show duration of the product timer and price?