I confirm the respawn rate on the Elysium server. On Sunday 28.5.
At 18:15 I saw his spawn at 65-24 and I tried to tame him with other hunters. I failed. The population was aroung 6600.
So I calculated the respawn to be around 2h and 5 min. (5.5h * 2500/6600 .... 2500 is the a fixed constant)
I tried my luck at around 20:00 at the spot 33-25, where it was quiet, just one hunter AFK.
At around 20:15 I started to be thrilled. He really respawned in few minutes. The population at that time was around 6400. I tamed him, yeah !!!