Seven years or so. Between his age and the fact that a reasonable chunk of successful missions for the company during his tenure have ended with his 'Mech with more armour on its back than on its front, some of the techs and such would probably consider him a bit of a good luck charm; as long as enemies are shooting at the Slab-sided Awesome instead of the more fragile lighter mechs, the company is going to come home as safely as he can arrange it.