well, as you say depends on number of people...
we find about 2 working on removal prep is about as many as can get round the engine without getting in each others way, about 6 to drop her out, 2-3 of use spannering to look at condition...
wellesbourne no.3 so far has take about 1 day to prep for engine removal, 20 mins to drop her out, probably about 4 days looking at condition, then back in... so will probably take us about 6-8 days
I believe we are aiming to have 655 running again by late feb/march