I have loaded up my bike and run files from my Garmin 310. I love my Garmin because the satellite is very accurate and I can see where I need to improve during a race. I was interested to see if I could tell the total amount of time I had to stop each time to fix my chain. It looks like 2-3 minutes.
Around miles 7 and miles 10-12 of the run I was feeling at my lows according to my splits and thinking back on the race I think this is accurate!