I would say seven cubes but although that is only 38.5 inches tall.
Probably around 5 or 6 for the average bot
I think we’ll see double digit stacks as the season progresses.
As the season progresses we will see numbers change. For early season I suspect around 5-6 to be the number and for it to slowly increase until worlds where at most i would expect to see the highest stack be something like 10-12 high. It’s all going to depend on how you go about staking the cubes though.