If nothing else is specified, tracks that loop should loop 2 times then fade out.

Airman ga Taosenai.nsf - loops at 1:06
beast.nsf - loops at 2:08
Elec Man.nsf - loops at 0:42
gng.nsf - loops at 2:28
Knightmare.nsf - loops at 0:19, loop 4 times then fade out
Mega Man X3 Intro Stage.nsf - loops at 0:41
Memories Of The Past.nsf - stops at 5:41
Namco Emulation II.nsf - loops at 1:08
NemesisII.nsf - loops at 0:34, loop 4 times then fade out
path to sanity (n163).nsf - loops at 0:43
PleasureOfTension.nsf - loops at 0:51
U.N. Owen Was N163.nsf - loops at 2:05