Hatfield varies that, depending on need the need for starting strength or elastic-reactive explosiveness. Still, most stuff is X tempo, since it allows higher output and also desensitizes the GTI, helping the body adjust to greater strength levels.
Vince Galanti also trains only 3, maybe 4 days a week. Given their small statures and low contest weights, both are probably on the lower end of the chemical usage spectrum. I'd much rather look like Dex than Ronnie though! (take a look at Dexter's toes in his pics though. They are weird lengths and all screwed up. Wonder if GH caused that?)