USB connector durability: plug vs socket
Just get to digikey and search for connectors, then check out the datasheets:

Example 1: micro B receptacle: 10000 cycles
http://www.digikey.com/product-detail/en/amphenol-fci/10118192-0001LF/609-4613-2-ND/2785387

Example 2: micro B plug: 10000 cycles
http://www.digikey.com/product-detail/en/hirose-electric-co-ltd/ZX40-B-5S-UNIT(31)/H125260-ND/5994726

Example 3: micro B plug, different manufacturer: 1500 cycles
http://www.digikey.com/product-detail/en/keystone-electronics/941/36-941-ND/2745653