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Yes, I've previously done that with my old Garmin for anything over 100. But having 'upgraded' to an 810, I wasn't anticipating it would have already crashed twice before 100. By which point I decided I didn't really care about the data much.
Mad Jacks was a route that looped 3 times through the same control, so wasn't great for following via GPS.
It can help breaking down the ride in several pieces and then stitching everything back together with fitfilestools.com
I generally restart the recording every 100km (on a touring)