Others may have different approaches, but on the longer rides I've done, I've tried to keep my stops short. On hilly rides especially, my legs tend to get really tight and heavy if I stop for more than a few minutes. At the Horsey Hundred, I made the mistake of stopping at every rest stop and hanging out for a bit. Not only did it make the day really long, but it made the next few miles after the stop pure torture. Since then, I get in and get out in as little time as possible. A lot of organized rides have very frequent SAGs. It's nice to know that they're there, but you don't necessarily have to stop at each of them IMO.