The 2.5 hours period is not feasible for many projects. Also human brain likes changes. For example if you are doing 2.5 hours routine and you get bored of it, then you can change to 1.5 hours routine with shorter breaks. This way your brain feels refreshed. I would love to go for a swim but it just never happens. During work pressure I just cant take the time to get out and have a fun day for myself. But I do take the time to cook. Cooking is my hobby so it kinda makes me relaxed when I cook or bake something. But whatever it is, making time table or scheduling work usually helps. I always feel I am more productive and it also gives me positive vibes to continue working. Staying healthy is important during these times, I tend to eat the most unhealthy things when I am working. So now I take the time out to go grocery shopping and put fruit eating sessions into my schedule too. also I used to eat a pizza everytime I would get hungry, because its very convenient to order and eat. But now I take the time to cook myself proper lunch and dinner. However, I feel like I am becoming anti social by doing all this. But I guess its just growing up and leaving the extensive overnight parties behind.