I did it in 6 days two years ago, my first ever long distance walk. We started on a Thursday in mid-May, had three glorious, hot days at the end of the walk and never got bothered by a single midgie. And they love me, so any midges about would've made a beeline for me.
The Thursday thing worked well until the last day (Tuesday). For some reason the opening stretch along Larigmor after the initial climb was like Sauchiehall Street on a Saturday - fekk knows where they all came from, we only recognised four other people from other days on the walk.