How long does the presto possible last? The next tempo indication is the Meno mosso before the coda, but it seems to me everthing between should be a gradual decresc and rit through the perdendo.
The coda is marked Piu vivo which means More vivaciously. Well, what could be more vivacious than that descent into the lowest bass? Old Sergei was just full of fun, wasn't he? Seriously, why are there two versions of the coda in the Schirmer edition? The short one is more effective, in my opinion.
All in all, a cheerful little piece to rattle off in a spare moment.