Unless your 401k has a good stable value fund or some good investment options (most 401k's do not have great investment options) I would limit the transfer to the amount needed to get me from ER to 59.5.
IOW, no need to do the whole thing unless you need the money from ER to 59.5.
If something cannot endure laughter.... it cannot endure.
Patience is the art of concealing your impatience.
Slow and steady wins the race.
Retired Jan 2012 at age 56...target
65/35/0 AA TBD