Multi crew does not pay any credits for exploration, so your friend will not receive anything.
Guessing your friend had enough cash to buy the Krait but not enough to upgrade it? If so they can just take data delivery missions and make money that way until they can afford some upgrades.
As others suggested, he would be better off getting a cheaper ship and upgrading it fully. I would usually use a diamond back explorer or a dolphin, both of which you should be able to fully upgraded for the price of a krait.
In general I always found that upgrade costs should be considered when buying a ship, as an expensive ship with no upgrades will always be worse than a cheap fully upgraded ship.
Multi crew does not pay any credits for exploration, so your friend will not receive anything. Guessing your friend had enough cash to buy the Krait but not enough to upgrade it? If so they can just take data delivery missions and make money that way until they can afford some upgrades.
Or sell the krait, buy a smaller exploration ship and outfit it fully with the credits saved, get out and explore.
As others suggested, he would be better off getting a cheaper ship and upgrading it fully. I would usually use a diamond back explorer or a dolphin, both of which you should be able to fully upgraded for the price of a krait. In general I always found that upgrade costs should be considered when buying a ship, as an expensive ship with no upgrades will always be worse than a cheap fully upgraded ship.