Limits of MBLD event

The current MBLD record stands at 59/60 just under an hour held by Graham Siggins from the USA.

If the methods of letter pairs/letter quads, and practice for 3-style execution is more fine-tuned.

What do you think will be the upper limit on the MBLD event.

Top MBLDers think 75 cubes will be the limit to do that sub-hour. I think it can be much more if systems like letter quads and 5-style edges are used.