I joined last February so this will my first holiday season with PBS.  I was wondering if I need to expect the length of time for a book to get to its destination to be longer.

Probably. Its slower in the winter in general dunno why. Maybe more people are ordering things that would be shipped media mail cause they cant get out and do as much.

I think the PO is already beefing their service up.  On sat a PBSer  mailed my book from MA and it arrived today (Mon) in UT.  Now that's quick!

With MM probably.  MM is sent on a space available basis.  First class shouldn't take too much longer but you never know. I have a couple that are past a week now and usually even w/MM they get there within a week. But then a book I dropped in the blue box on Th afternoon was there by Sat going first class.  It went from WA to FL in 2days.