Same here , out of all the people I have taken out over the years very few have matched my high standard.
A lot just can't handle being out day and night or all weekend .
When I used to do a lot of rabbitting in the Borders we used to ferret all day and lamp all night , couple of hours kip and at it again . Seen young lads nearly crying as couldnt hack it ,we used to sleep in the shepherds bothy either on the floor or on a bench , christ it was cold.
I remember one trip to a new piece of ground , we were out all day and then lamping when it started pissing down . This was in Jan