Although this was a while ago, when I had more time, I went through the stages in ~2 weeks, though it most likely took longer than Absol because my primary erectrum source was Ai3s until I built Rol/Hope, then fully upgraded that (which is still a semi-viable FG grinder, I just didn't want to take the time to get SoRs/Ds/Sacs on that account.
On the other hand, when I first created my account when I started playing, I went from Ai2s for a while, then (when I discovered forums/mono death rush) Ai3s for a bit, then I spent the next month or so grinding with Liquid Antimatter before realizing there were better decks, and I went to Rol/Hope, and then eventually upgraded that fully. That whole process probably took 3ish months.
Basically, it's not too hard to achieve a fully-upgraded deck from nothing, but you have to have the right decks, ideas, and know-how. Seems like newbies could easily achieve that if they discovered the forums/different source of decks right away, otherwise, like me, you might end up grinding Ai2s with the starter deck for a looong time.
EDIT: Capsios you nub, can't gain nymphs from donating.