I didn't bother to log it because I'm pretty lazy about that when the station in question is a regular copy, but a few days ago they stayed on all the way to 0049 UTC. Guinea is in the habit of treating their scheduled broadcast times as polite suggestions rather than as a time commitment to be met, and when it comes to the sign off time it usually cuts in the opposite direction, happening well before the listed time of 0001 UTC. But sometimes it's to our benefit, and is nice because they play more music at that hour.