A good average recreational dose for a person who has experience with drugs would be anywhere from 60mg (lil benzo expereince) - 120mgs... But like others have said there is a very fine line between not really feeling much and blacking out & acting like a fool or just falling asleep.. I would say 90mgs is the usual "recreational" dose...
As far as effects, I actually think Temazepam is not that euphoric at all or even that great compared to other benzos out there.. I would say Temazepam is just too un-predictable when you dose, sometimes 90mgs will just relax ya, then sometimes it makes you kinda act a fool.... In my opinion Temazepam is good for only one thing, and that is exactly what it is prescribed for - SLEEP.. After all it is a Hypnotic Benzo, and thats why its only prescribed for insomnia.