I think the main problem I've faced is NOT KNOWING how much time to allocate for different tasks. Sure, you can learn from past experience (e.g., "last time I

I think the main problem I've faced is NOT KNOWING how much time to allocate for different tasks. Sure, you can learn from past experience (e.g., "last time I needed to write a report like this, it took me a week"). But that means your brain must keep a memory of events+ellapsed_time, which is something my lazy brain avoids at all costs.