Hah, yeah. I've certainly had to explain why a seemingly simple request would take a while. And I have also looked like a genius more than once when I whipped out something I'd developed years ago that took me a month, tweaked some parameters and other simple changes, and had it a few hours later.
Unfortunately, the more of the later you have, the more people seem to get frustrated at the former.
Unfortunately, the more of the later you have, the more people seem to get frustrated at the former.