My son is at an Aviation University as we speak, and the minimum Multi-time is 50 hrs for the restricted ATP (which he qualifies for). He received about 18 hrs ME for his MEL, and has been lucky enough to fly a twin during the summer for a gentleman that owns a C-310. Multi time is not an emphasis item once you've met the mins..the emphasis is on building time towards the magic 1000 hrs (restricted ATP).
On a side note, HackerF-15 shacked it! I remember back when I was attending UPT during the T-38 phase, I went home for Christmas break. My best friend was at the local airport flying a "hot" little GA plane called a Varga Kachina. He asked me if I wanted to fly with him. We lined up on the runway, and he says "your aircraft". I proceeded to firewall the throttle and release the brakes, at which point he slams the throttles back to idle and screams ***!! I was used to flying the -38 and that's how we did our take offs...as Hacker said, you know what you know until trained otherwise.