[Spaceships] Query: Activating Mag-Sails

[DaltonS]

A magsail requires one Power Point to activate, but no power to maintain once powered.

Spaceships 1, page 25

How long does it need one Power Point to activate? Could a small power system and an energy bank work? How long does it take to "deploy"? If it has to be "deployed" to work, can it be "undeployed" and stowed inside the hull (after being "deactivated" of course)? I searched for the word "retract" in Spaceships 1 and I only found it referring to landing gear and exposed radiators. Are any other "exposed systems" retractable? Or is this a special feature that costs money?

Dalton “who hates exposing his ignorance” Spence