słownik polsko - angielski
- 
na określony czas po angielsku:
1. 
indefinitely
The trial was postponed indefinitely.
the account will remain active indefinitely.
It is pointless - even the state cannot live beyond its means indefinitely.
it's not a reasonable expectation that you're going to stay married to the same chap indefinitely.
The emotion they gave me was exquisite, but I could not preserve it, nor could I indefinitely repeat it; the most beautiful things in the world finished by boring me.
Will the universe expand indefinitely?
for a definite period of time 
for a specified period