I have not seen this noted anywhere so far (comparisons are always with Kittinger's jump duration), but it's actually a great point. Only the longest free fall would have to be counted inbetween station boosts, so it would presumably be a lot shorter (but maybe a lot longer than 4minutes?).

Way longer than 4 minutes. Station-keeping boosts on Mir were done only a few times a year (and were usually done by attached resupply crafts).

Edit: Here's a cool altitude graph for Mir: http://en.wikipedia.org/w/index.php?title=File:MirOrbitalMan...

I've been in free fall around the sun for about 30 years now, doing around 60,000 mph the whole time. Where's my prize?

I took it by doing it longer than you.