The Mechanic Trick 'Inventive Engineer' has the option to "during Starship Combat" "double the regeneration speed of your ship’s shields"...
So what does this actually do, considering Starship Shield Rules state "regeneration occurs only when the ship is not in combat"?
I also asked this question in the Starfinder_rpg's Discord and it was suggested it has nothing to do with regeneration (even though Shields specifically have a Stat called that) but is instead intended to double the Shield restored by Shield-Restoring Effects (which as far as I know is an Engineer's Divert and Overpower Action if diverting to Shields)
(And it's rather hard to correlate the duration in Turns to a Ships regeneration in minutes if out of combat use were to have been the intention...)
https://discord.com/channels/327471903663194112/327472814804172801/83477406 2471446558 for reference