There is no way the average user is shooting full 10s snaps 10x day. I use Snapchat regularly and that describes the top eschelon of users, which might be Spectacles users, but probably not all of them. I believe that is a vast overestimate.
As with most statistics it's likely normally distributed. I know teens send/receive in the hundreds per day - mind boggling really - and the celeb accounts post dozens daily. Even back in 2013 the numbers were staggering.