My initial entry was a few thousand cards, and I did it late evenings and on some weekend days over a few weeks. I was already pretty anal, though, and had most of the cards sorted and boxed before I started entering them.
Last summer, I more than doubled my collection (picking up bulk commons and uncommons, and also getting into collecting the current sets). More evening and weekend time.
Since then, I've been pretty religious about entering my cards right away--usually within 48 hours. I have one page in my trade binder for inbound cards, and I either write a list (large trades) or snap a photo (small trades) so I can adjust my inventory. I picked up so many over the holidays that I got a bit behind, but I'm back on top of it now. I have about a dozen cards to add (including three Goblin Sharpshooter--Yippie!) from the last two days.
I have over 11k cards in the system, and anticipate adding many more in the future. Welcome to the community!
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TradelistBlack and Blue--not just for bruises anymore.