For a time znaczy: przez jakiś czas...
used for saying what happened or existed during a short period before it changed
We were quite happy for a time, until his brother moved in. (źródło: Macmillan Dictionary)
... a także: na jakiś czas
I would like to park here just for a time.
She told me that it is just for a time. (źródło: diki.pl)