I can attest to this. There have been times I spent 20-30 minutes understanding a new problem at 5pm, which at the time seemed like it was going to take up a s

I can attest to this. There have been times I spent 20-30 minutes understanding a new problem at 5pm, which at the time seemed like it was going to take up a significant amount of my working hours the next day. Then come back the next day and I'm able to finish the task before 10am. During the evening, the problem was solved both consciously (thinking about it on the train home) and subconsciously (whilst sleeping). I just had to produce the deliverable the next day.