In order to loose the least amount of time, what I usually do is to export a reference movie (not self-contained), which doesn’t take as long, and then convert it using compressor while I keep editing. I found it to be the fastest way to keep working while still delivering to the client. The compressor stage is to make the file self-contained so that it would open on any other computer, regardless it has the raw footage you have on the timeline.
Hope it’s usefull!!
Regards!