As long as you can pee with it on. Otherwise you're definitely constricting too much to use all day.
My experience was it sucks at first. Took some conditioning time to get used to using it for longer durations. The first ring I had became too small to use safely before long so I got an adjustable and started using it as a full scrotum ring. Works great and keeps a pump for a long time. I definitely recommend putting the time into it. Just watch for numbness. If you get numbness you need a bigger ring.