1 minute/mana

As two actions, your familiar within 5 meters of you takes over the responsibility of maintaining concentration for a spell you have cast that costs 1 or less mana and are concentrating on. While maintaining this concentration, your familiar is incapacitated. If this spell’s duration expires, the spell you transferred to your familiar ends.

Augment

The spell that you are concentrating on can cost 1 additional mana for each additional mana expended.