There is a similar phrase in the computer software world ... "the last 10% takes 90% of the time".

I started working on a trainer kit in the June or July, figured it was 90% by mid-August. After labor day it still seemed 90% so I bought an ARF Alpha to take advantage of the remaining good fall weather.

While it was supposed to be 1 hour to assemble and to get it flight ready, it took me 5-6 hours to get it assembled and get the servo throws correct. A fellow club member's Alpha didn't require the adjustments mine did and was ready in an hour.

I guess it just depends...

Cheers,

Cub