Editing Process

[Jonathan Wilkes]

Hello,
     I recently finished entering 14 pages of music for a piano part of a 
duet.
     Going through the score, I see about 100 errors that I want to fix.  
But now that I have the entire part entered, Lilypond takes about 40secs 
to compile.
     I probably should have asked this before I started: how do the 
Lilypond experts edit their work and fix mistakes?  Even if I only need 
to check results for 20% of those, that's about 15 minutes just for
compiling the score (and that's assuming I get all the property names and 
offsets right).
     Any advice?

Thanks,
Jonathan