I only play slots and after 30 minutes i usually get bored no matter if Ioosing or winning. However 30 minutes could have a huge effect your balance if you play volatile slots 
30 minutes is extensive to me, under 1 to 10 minutes you could drained your account if you go for higher volatility games than lower ones.Though most times you could get bored if you don't go for your choice based game than going for a higher RTP games it could make you lose your bankroll so faster and after which you may likely becomes boredom, so, playing games that you are already familiar with could enhance your passion and love for the game you are playing.