30 there is no size limit to pyramids, but the higher the pyramid the more points, so as to discourage making a bunch of tiny ones
imagine this pyramid:
X
X X
X X X
X X X X
now at this point, the next player could either continue building the pyramid by typing X X X X X,
or start deconstructing the pyramid by typing X X X
if he started deconstructing, the pyramid would start having less emotes per line instead of more
when the pyramid reached only one emote again:
X
XX
XXX
XXXX
XXX
XX
X <---HERE
then points would be scored based on the height of the pyramid
the peak of the pyramid shown above is 4 Xs to the right, so they would gain points accordingly
if at any point someone interrupted, the pyramid would need to be restarted