Posted By:
Jason LThis is an interesting question.
I would say that historically, it has taken me very little time to add cards to my core collection, but that is because this was during my building phase. This has since slowed, and the cards are becoming a little more difficult to come by (mostly because of cost). I chose the commons-first method of set collecting.
Going forward it will only take longer and become more costly as more expensive cards are needed.
However, I also feel compelled to say that I am nowhere close to owning a collection that could be liquidated and actually satisfy any financial crisis! 
If I had to fire sale my collection, it would only cover a few months' worth of lunches at Wendy's!
(my palate is loving their new twisted chooclate Oreo frostys, by the way!)