Scotch Corner was my longest ever hitching wait - we're talking about several hours, and then having to camp there overnight, to continue trying to hitch in the morning. I stood at the exit from the services with my thumb out. A massive amount of people stopped to offer rides, but EVERY single one was going South, and I wanted to get to Scotland. Thankfully, the services have free toilets, plug sockets in the corridors, and food. I slept behind the bushes, and it was okay. Since then, I've hitched from there two more times. It seems to be a great spot if you're going south. If you're going North, it's better in the morning, but harder in the afternoon and evening.