As of midday Hobbes will have set a new record. Five days.
sigh...
Have you tried luring him down with food or something? I don't know what to tell you, other than to climb up there and get him. I hope he isn't stuck. Five days is a long time to go without eating.
He's far too high to reach this time (40-50 feet I estimate). My basket contraption on a pole, even standing on a ladder leaning at a very uncertain angle enabled me to perch the basket up there about halfway with a dish of food in it. I did that yesterday to encourage the idea that "there's food down below if I can just get to it", which would require him figuring a way to do the first 20 feet.
Left it up there all day but he didn't take the bait. Something did -- the bowl was cleaned out.
Unfortunately I don't think this tree would support a human weight at that height even if somebody could climb that high -- it's too thin. The guy would probably fall into the rocky creek bed below from fifty feet up. Somebody suggested cutting the tree down, which would fall either into that rocky bed, into other trees, or across my driveway.