Barrages endure whole days!
They are independent of times and expire during the night. A player is unlocked at the next day if the barrage is not apparent neither on the Team- nor on the Playersheet, means if the red warning box at the top of the playersheet is gone.

Example:

Player X gets 4 Penality Points which expire on 8th December. During the night from 8th to 9th December the barrage is still displayed.

Consequence: The player is still barred till the barrage is deleted during the Downtime in the early morning (after it is killed out of the cache)