Around 10-9 years ago I was mountain biking with 2 friends. I remember walking.... 1-2 miles off the mtb trail and then another 3-4 miles on the road going home. I remember it being a mechanical since half way through the walk I was thinking "dammit I should have tried fixing X issue".
Don't tend to get a ton of road mechanicals. Instead I sometimes can't make it up the hill and have to cramp walk/ride a mile or two back.