@layman,
Are you American? You miss one thing I said
-If you
mention the exact time, you don't use
later. Do you agree with me that that sentence is wrong?
Even in American English, you don't say
I'll see you three days later. If you omit
three days, the exact time, that's fine. The problem is, in my first post, 'writing essay' seems to be a reference point; if we say
several years later, we might justify it and say that it is the same as 'several years later than the time you wrote the essay', which situation is different from
I'll see you three days later.