Nice datapack, one thing that would make this even better is to make it stop counting playing time if a player goes afk but it might be a bit tricky though. Also you might want to remove the command that puts the sendCommandFeedback to false i had to delete it myself to see some commands in chat.

it doenst work for me im playing on 1.17 is that a problem
and im playing online

This datapack may seem small but its what it features that counts.