In my old PC I have an Intel 530 SSD, purchased October 2013, this has had a total 6.62TB of data written to it, with a total power on time of 52 days.
My main PC for the last year has the following.
SanDisk Ultra II 960GB purchased 29 April last year, 2.4TB of writes, 32 days power on time. This drive is used for transcoding Blu Rays, so gets a lot of data written to it.
Samsung 950 Pro 512GB purchased 28 January last year, main OS drive, 2.4TB of writes, total power on time 39 days
I gave up worrying about the amount of writes to an SSD a long time ago, as you can see from the results in the first post if I continue at my current rate I should be good for over 300 years going by the result from the Samsung 840 EVO or 1000 years going by the 940 Pro. I think it safe to say I will have given up long before then
I've attached a benchmark of the 950 Pro, not as quick as advertised but that's not a controlled test so other things could be affecting the results.
One thing that's increasing is the total power on time, contrary to my wife's opinion I obvious don't spend all my time on the PC