My holding period is little longer...due to my mobility (trade these in partnership), and my personal comfort with a short time frame in notes/bonds. I've been short (10s) since thanksgiving with no timeouts. 4.1-4.2 on 10s is where I step out probably, as I am not willing to gamble that QE2 a-la 3-18-09 isn't again in our future to rein in mortgage rates in that scenario. If similar style QE is employed again while im short, i'll double down. If I im not in the market when it happens, i'm shorting. And if things don't go my way, i'm out at 2.9. To your point though, yes a lot of uncertainty and resistance at this 4ish level.