SNES/SFC/XLC versions only, the PS1 version of X3 is not allowed. Timer starts at "Game Start" in MMX1. Time ends when you lose control of X after the final climb in X3. Gametime is calculated as the sum of times of each game without swaps detailed on the multi game rules.
Multigame run rules: https://megamanleaderboards.net/index.php?page=multigame
Low% rules: Beat all three games without getting any upgrades. This includes armor parts (except mandatory boots and arm parts on x1), zero parts on x2, ride armors on x3, sub tanks and heart tanks.