Hello good morning, in my experience playing more than 5 hours is stressful unless I have the whole day off and do not have things to do, I play calmly without rushing and totally relaxed, for me a good time to play would be between 2 hours at 4 no more, if instead you are losing a lot or you are anxious or you are not focused try to play less and if things do not go well, play the next day every day is different and you will have new experiences in poker as well as in life So cheer up, always keep playing with faith that everything will turn out well, good luck at the tables, I hope to see you there.