My mate does EVOs all the time. He did a clutch yesterday. Does it in 1 day.
 
He changed my clutch too. 2 hours everything was on the ground with the clutch off. Waiting another hour or so for the new clutch to arrive then about 1.5 hours to put it back in. He works by himself. It is tricky and the gearbox is fkn heavy. When he was working at another place three of them held the box up under the car and slotted it in.

Any AWD/4WD is going to be harder on clutches than an MR2, obviously wheelspin or lackthereof in the case of the Evo will make a big difference through higher stresses on the driveline. The older WRX gearboxes were basically made of glass lol
I'm sure Totenkopf knows what he was doing, and I bet the very first time your mate did an EVO clutch it wasn't in just a few hours...its just probably a real **** compared to doing an SW20.

Time wise the clutch wasn't too bad, I started one afternoon and had it back in by the following afteroon, I wasn't doing anything much before lunch time or 1pm (or later).  Probably took me 6hrs or so, the fact was, it was a nightmare (compared to an MR2 at least).  The transfer case was jammed between the engine and the firewall, the selector cranks on the gearbox were hitting on the chassis rail on reinstallation. 
 
Its a situation where you could quite easily do damage (however minor, scraping up the frame, damaging transfer case or hydraulic line attached to said transfer case).  I am pedantic, I don't like damaging things, scratching **** up unncessarily, etc.   Honestly, I'd have much prefered to remove the whole subframe and do it that way, and probably should have cause I was doing the timing components at the same time.  I also had to undertake push to pull conversion on the clutch, which involved some machine work on the clutch slave cylinder.
 
The clutch would then not bleed at all, ****ed around for an hour before googling that you have to overfill the resevoir to get it to bleed - bloody hell.