Let's say there's a timed competition where the objective is to write the biggest number - let's say 5 seconds. Can I just diagonally keep writing smaller and smaller nines on top of each other to the right? I.e nine to the power of nine to the power of nine to the power of nine etc?

So for the whole five seconds I just keep writing nines. Nine to the power of nine is already 387 420 489. If I take that to the power of nine, it would be (I googled it) 196 627 050 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 I think. So can I just do to the power of nine like.. 10 times stacked.

9 to the power of 9 to the power of 9 to the power of 9 to the power of 9 to the power of 9 to the power of 9 to the power of 9 to the power of 9 to the power of 9 to the power of 9. Is this "legal"? I'd easily win the competition.