I'm a Ranger returned to the Glade to finally earn all my Ivy Etched armor.
I finally got Wilton to spawn. As some others have said, he will spawn just as you are logging out.
My tactic was to kill the "a buccaneers". I killed the buccaneer at least 20 maybe 30 times. They are on a long spawn cycle but it was usually less than 72 minutes for me as I was timing them. I first camped here around level 27 and he would have been tough. I am level 41 now as have been killing Gornit while I waited for the buccaneer.
Some players said he spawns at 10am or 11am. That might have been true for them and was for me at first, but he ends up spawning some certain time (~60-70 minutes) after you kill him last. So sometimes it would be the afternoon, or evening in game time.
I also found and killed the Ancient Cyclops during that time. Good luck everyone.