Good question
I actually got mine about two weeks ago but every time I intend to start breaking it in I have a rushed morning so it's STILL sitting in its little plastic tube.
Oil the handle every now and then - they shine great, look clean, and make it last longer.
Like with every tool or equipment, there is a wide range from 1 year to 50 years I would say.
But taking good care :
soaking in only medium warm tap water
swirling gently on the soap
using only the upper 1/3 of the hairs taking up soap
cleaning it properly after use, getting rid of all remaining soap
shaking water out
drying it on a towel
leaving it well ventilated
cleaning as recommended in shave wiki on a regular basis (dep. on water hardness)
+1. This is my daily routine!