Forum:1 Full and 2 Quick Playthroughs

Hey everybody, I'm looking to get to level 60 in ME1 sometime soon. I finished the first playthrough while completing every mission, and reached 50 near the beginning of Virmire.

Now I'm trying to get to level 60 with the *same character*, but I don't want to do all the tedious missions all over, so I was thinking of doing two very quick playthroughs on Hardcore and Insanity. Are two more basic playthroughs enough to reach level 60? And if so, would I be barely getting there or easily achieve it with the 2nd (3rd total playthrough)?