OPNLguy From , joined Dec 1969, posts, RR: Reply 1, posted (9 years 8 months 3 weeks 6 days 6 hours ago) and read 769 times:
Aviation Partners Boeing had an ad on the back cover of either Airways or Aviation Week (can't recall which), and they mentioned retrofit time for the 737-300 as 3-5 days, IIRC. I presume the -700 will be in that same ballpark, and tend towards the lower figure as the learning curve kicks in after a few installations.