Haven't added up the points (and not sure if the player really is FULL gear), but let's say it is 15k marks needed. That's 50/win at level 50. That's 300 wins needed (not counting loss points). If you are premade, then you get in faster because you bring a tank and healer. If you have SMN/SMN/WHM comp, then you are pretty much the strongest comp. If you're already wearing full DL/relic+, then you have an edge over many players. If you already know how to burn and what to burn, especially in dealing with pugs, then this is pretty much a win-all-the-time affair. Maybe 15 hours of farming over a couple of days. It's totally possible.

EDIT: I like how the options are (a) alternate farming method or (b) no life.