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 wolf is fed by his legs
Repetition is the mother of learning.
Strike the iron while it's hot.
If you like sledding, you should like to carry the sled.
The apple never falls far from the tree.
One head is good, but two ones are better.
Don't bring your set of rules in a foreign monastery
Start taking care of the dress while it's new, and of your honor while you are young.