Two days (about 1hr total) because I made a habit of only doing 10 minutes at a time so I would not get into a hurry. I would do it on break from the computer.
It was the one from work (nice one) it's a regulated Weller with a standard tip. The tip is somewhat oval, just don't use a pointed tip. Grind it down first if that's all you have.
They don't really develop. You can always go over it again after it cools (5secs) to smooth it out.
Go SLOW, take break, listen to streaming Smooth Jazz :)
I shot it today.. awesome! :)