I only can assume: 1.5 months rounded up, using 31 days a month 31+16=47

So you get half a month to realize that your monthly automated renewal is broken?

But the fragmentation on SSDs does not really matter, does it? Yes you need to keep track of all the fragments but this is not really a problem as far as i am aware. To my knowledge, increasing latency on bigger storage is a problem that faces all storage technologies we hqve atm.