How do you organise your work day?

I recently moved to a dedicated office to work on my startup Shipr, and since the past week, I have been working continuously from 7 am to 7 pm, but by the last hours, I'm super exhausted and I can see my efficiency going down by a lot. Curious to know how much time you spent on developing new features daily. And do you focus on just one aspect for the day, like developing new features, or it's more like developing earlier in the day and then later marketing around evening. After purely focusing on developing the whole day for the past week, I've been thinking about trying developing new features before lunch, then after lunch doing bug fixings, optimisations and marketing. What are your thoughts on this?

I cannot code beyond six hours of intensely focused coding work. That too is an outlier and the average would be more around 4.5 hours on a day to day basis. I keep the coding for when I will feel the freshest during the day. This varies as my sleep cycle keeps changing, but generally if I have had over 6.5 hours of continuous sleep, I make it a point to exercise and then after that as the body is recovering from the exercise, I can sit for longer hours with focus and that is when I code. Later in the day, I might do other work.

Same as for @singhshashi. I can't code more than 5-6 hours per day. To be honest, I believe nobody can do and write a good code.

I usually do coding for my side projects in the morning for about 1-2 hours. Then I switch on different activities like making YouTube videos or writing until the first meal. After food, I work for my part-time job coding for 4-5 more hours and I'm done for the day.

The most productive day is definitely before the first meal (around noon) for me.

7-7 straight is way too much! Biggest tip I could give anyone is to get out for a walk for 45-60 mins in the middle of the day. Totally clears your head.

I usually code in 3 hour blocks with some small breaks during the blocks and bigger ones in between. In the bigger breaks, I am trying to walk for an hour, exercise or some times do a power nap of max 45min. That really helps!

Switching between different kind of tasks such as marketing and developing helps me as well.