enemyMiG,
Controllers are pestered on their days off and while on their way home from work about returning for overtime.
Many will not answer their phones and those that do, not many of those accept taking on more hours; which is why there are various airspace closures every day.
The folks over at Civil Air (union for ATC) are a very helpful bunch and will possibly elaborate further!
Also, try Ruski Standard (great Russian Vodka) - hopefully you can find someone who can read the cyrillic alphabet to determine which is ACTUALLY R/S!
