It depends, maybe your LMIA is valid for 2 years but your passport will expire after one year so they will issue to you a work permit that is valid for one year only.Once you renew or extend your passport validity you need to extend your work permit to match the LMIA expiration. Anyway as far as I know LMIA is not issued for more than 2 years. LMO was previously issued up to 3 years