[psunavy03]

Two beers per 45 days at sea, and only if no port call is scheduled for 14 more days.

Ships usually pull into port somewhere in the world more often than every 45 days outside of large-scale combat.

[yamazakiwi]

Depends on your command, I was forward deployed and most of our deployments were longer than 45 days without port.

Could be different now