Rinse cycle taking longer than the timer says and

its likley to be a fulty timer,, or a slightly blocked pipe taking longer to fill up the washer,,it could even be the filter needs cleaning
the point is,,,if its still working, whats the problem?
only try to fix it if its broken and not working at all? just check the filter and feed pipe,,,wate till it gives up on you,, why spend hard earnd cash