After a few weeks of farming Rustfeather across 11 toons (on the same server) sequentially, I can say with relative certainty that his respawn timer is 15-30 minutes, not 15-45 as this addon says.

Thanks. There does not seem to be any "offical" timers and wowhead comments are disagreeing. I agree that it's probably not 45 min, and 30 min is more in line with what I've encountered as well. I've changed it to 30 min in 541c680. If it's incorrect I'll "hopefully" get some angry reports.