10, for the nifty (and out-of-focus) David Tennant-style Sonic Screwdriver, and 4 for the super-long Tom Baker season 12 scarf. Hence, the 10.4th Doctor - my personal favorite (okay - I'm biased - he's my husband)
I started the scarf for him the second week of January, and it took me about a month. There was still PLENTY of time left in the winter for him to get use out of it. I think that this scarf may have been one of THIS doctor's favorite "companions".
Oh, and... the pattern came directly from the fine folks at http://www.doctorwhoscarf.com