how long would this take to get ran through?>

You can easily do it yourself with a lvl 100 or higher in a few hours if you're referring to the iron bound proto from the ahiv glory of the raider.

If you're referring to Mimiron's head that you get off 25 Ulduar Yogg Hard Mode 3 if you're running on a 110 it takes me 30-45 minutes a day to run through all of Ulduar. 100 Would probably take me 1-1:15.

I do this weekly on 12 110's and still haven't gotten this mount... RNG bullshit, no legendaries, no mounts, nothing

just the ironbound proto drake from the glory of ulduar 25

I can run you through it if you want