Wow, that's not much... my kid would probably hit that within a month. (I just replaced the motor in a Bachmann Thomas that wore out in about the same amount of time.)
That's why they're not fussy about replacing the few that wear out, the average use is frequently after the first purchase and then it drops off sharply so I guess they decided it wasn't worth designing around long usage. In the older trains you could replace the little motor easily, with the newer ones (starting with the infamous 'red' motor a long time ago) that practice ended and you have to replace the entire unit.
