I'm going to leave my friend at a bath house
Why would you leave him there?
Because he takes more time in the bath than me.
It can be frustrating when it feels like someone is wasting your time, but if you've agreed to give someone a ride home then you should wait for them. It's not fair to leave someone stranded without a ride, so if they're taking too long you should express this to them. Leaving them behind is likely to hurt the relationship.
I just wanted to text him so he can hurry up.
Well I'm glad you're going to try to communicate with him before leaving. We should never leave a friend hanging.