@Josh ******
when does the eVisa itself expire (the valid until date on the PDF) not the current 90 day stamp you're on
you can bounce out and back all you want until the visa itself expires and each time you get stamped in for 90days, even if you stamp back in the last day that eVisa is valid for you'll get a new 90 day entry stamp.
Most people get 15 months of stay out of those year long visas (in 90 day stays)