1st edition Mongoose Traveller.
Under the Reactions section of the Space Combat chapter on page 149 of the main rulebook, there's rules for shooting down missiles, and how it costs 1 reaction for each attempt.
Reactions are entirely based on the ship's initiative score, but point defence implies the existence of a manned turret with which to shoot down the missile. Similarly, firing sand requires a sandcaster and one reaction.
But it doesn't say anything about whether turrets are limited in how many times they can react in a turn.
Can one sufficiently motivated gunner use all of a ship's reactions to shoot down missiles and/or fire sand with their single turret?
Assume it's a double turret with a laser/sandcaster combo.
Primarily looking for RAW or errata for this in case I missed something important, since I'm otherwise planning on house-ruling this to avoid ship loadouts where the party's elite gunner can render a ship immune to huge numbers of missiles on their own.