There are many variables including drive size and the amount of data written to it. MLC lasts longer than TLC. That being said check this out and I believe you will see even the Samsung 840 Evo TLC drives will last longer than any other part in your computer.
http://www.anandtech.com/show/7173/...w-120gb-250gb-500gb-750gb-1tb-models-tested/3
Also if you read that whole page you will see those are official figures. In the real world people are reporting double those listed p/e cycles.
I just bought a 500GB 840 Evo. Since I will never write anywhere near 100GB or even 50GB a day to the drive it should last over 50 years easily. Or since I'm almost 40 it will probably last longer than me! 50-100GB a day is what you would see in a data center not for a home user.
If that's not enough for you the 840 Pro uses MLC and should last even longer.