a stitch in time (saves nine)	you had better do it now because later it may cause some problems
all in good time	used to tell sb to wait, be patient; all in its time
at the drop of a hat	bez gadania, natychmiast
before your time	before you were born or lived/worked somewhere
for good	without the possibility of change in the future
for the time being	for now
from time to time	sometimes, but not often
in/for donkey's years	an extremely long time
in the nick of time	in the last moment
once in a blue moon	very rarely
on the spur of the moment	instantaneously, without thinking carefully about it
the ohter day	recently