...As for 48+ means that he has anything more than 48:01 min played and 48 min means he has no more than 47:59 min played but i think this is common knowledge.
Just to be really precise, 48+ is actually 48:00 and above. That means one complete game of 48 minutes will get you 48+. The way you wrote it implies that you need one full game, plus a little time in a second game.
Still, your point about the lower than 48+ min and training is a good one, and I like the actual data you gave.