What is the optimum amount of leveraged long QQQ?

[murray t turtle]

TQQQ is up more than 100x since 2009.
What is the optimum amount of leveraged long QQQ?
To maximize profits in a bubble, what is the max long one should be?
I am sure many S2007S would say 100x. That is not a serious answer because a -1% move will wipe one out.

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May want to consider no leverage if you really think TQQQ is a '' bubble''??
Took some profits on FTEC + cash copper, but i dont know what a bubble is . I use a 200 dma PSAR ............+ sold my TQQQ earlier in month.
I also do QQQ + QLD=less drawdown/so there is more than one right answer on that.