I've long maintained that time estimates should not be a programmer's task, at least in most shops. That's one of the few things that a "manager" should do and

I've long maintained that time estimates should not be a programmer's task, at least in most shops. That's one of the few things that a "manager" should do and do well: insist on realistic and as-precise-as-possible requirements, collect metrics over time to make rational estimates, and shield the team from eternal corporate stupidity.