Hard to know even if you only drop it once it may take about 30s if it happens early could lose 60-90s if your 10 hours deep and your fingers and thumbs stop cooperating. Just ordered Dan Bighams book so got to be many stones left unturned for me i reckon.
Oh yeah, that's another one on the list. I think I'd be better off spending some more on testing - small position changes are likely to have bigger impact than chainguide removal but it's getting a bit late in the game for this and I didn't really want to spend much more money on the TT setup.
Plus the slowing->stopping time and the acceleration time and then there's the rage... and that's if it happens only once.