On a scale of one to ten, one being least and ten being most time conscious, the Marauders could be ranked as follows:

Sirius: 0.05 (the whole time he would constantly be pushed around by Remus)

Peter: 2.75 (he had the rest of the Marauders to keep telling him the time and urging him on)

Remus: 9.95 (in this case Remus was quite independent on his own)

James: a whole freaking 30 (and that too only for Quidditch)

***

James: "Guys, it's been an hour. Get your asses down here and practice!"

Sirius: "Honestly, Prongs, it's only been five minutes at the most since we finished the last round."

Peter: "What? Five minutes passed already? It seems as if I had just sat down."

Remus: "No Pete, a whole twenty minutes have passed or so. You should know that it's no use to ask the time from these two. Both are the extreme points of a clock."