With accent marks:
Де́лу вре́мя, поте́хе час.
Time for business, an hour for fun.
This is the expression of the Russian Tsar Alexei Mikhailovich (1629 - 1676) written by him in a book dedicated to falconry.
Meaning: most of the time shoud be dedicated to business (work) and duties, and less time - to entertainment.
It is usually said as a reminder to a person who, having fun, forgets about his duties.
Other Russian proverbs
A bird is visible by its flight.
Your own shirt is closer to your body.
One head is good, but two ones are better.
You see your friends in the times of trouble.
Start taking care of the dress while it's new, and of your honor while you are young.
Live for a century, learn for a century, but die being a fool anyway.
The one who walks will go through.
Another's soul is darkness.