'So long, snow days' also means 'so long, days tacked on to the end of the year, which is a waste because they don't do anything anyway.'
(Relax, there's still plenty of time to be a kid, play in the snow, and drink hot chocolate.)
https://www.pennlive.com/news/2019/07/so-long-snow-days-gov-wolf-signs-law-enabling-schools-to-schedule-days-for-kids-to-work-at-home.html?fbclid=IwAR2rMKkKs16FtIEi89doBsY-nrg1dFf-CpZXLJqHIHpdEk3Q_it2lYB9QyI