as this category has changed due to the level increase in order to obtain OP levels.... i think the way the route would go would possibly be NVHM and TCHM (Patch 1.1) UVHM and Level 72 (Patch 1.8.3) 72 to Level 80 (Current patch) 80 to OP10 (Current Patch) I could be wrong as im not someone who heavily speedruns bl2 anymore but thats the possible routing to it. HOWEVER there could be 1 - OP08 (legacy) and 1 - OP10 :think:
TheFunCannon did a 1-OP10 run a few days ago where he used older patches until he hit 72/OP8 and then he had to go to current patch for the rest of the run. it added quite a few hours to the run since on current patch he didn't have access to a lot of the old glitches.
17:32:31.95 he said it could be lower if it were routed but OP10 looks brutal.