Taking it off for 90 minutes every day is a bit much for me, I am rarely in one place for more than 30 minutes so I guess I will just have to go without the sleep monitoring etc and take it off and charge it at night
I sleep monitor with my Apple Watch series 0. Charge it up to 100% in an hour before bed, wear it all night, top it up while eating breakfast and showering, and it's fine for day.