Seem to remember doing mine pretty quick as well. Looked at the book for a couple of days before hand, hammered the online questioner thing (can't remember what was now) and did them one at a time like that. Took me about a fortnight I think. They used to be vote for joe, don't know what they are now. Some of them only take ten or fifteen minutes. The nav one is a bit long 'cos there's lots of faffing around on it marking routes up and such like.
I managed to do all mine in a fortnight after buying and reading all the pooleys books.
My instructor wrote the books, which I suppose helped a bit...