Ohhh boy... Lets clarify a few things.. the only time the lights should come on is when you first turn the key to the run position. They should both go out within a minute and then as long as you have the key on (while driving or otherwise), they should never light up again. If you are hearing the pump run occasionally and then shut off, that is OK. If you hear the pump run and the lights flash on/off, then you have a worn out accumulator.
You will be fine for a while, but you will have no ABS and as time goes on, eventually you will lose power brakes and the car will be hard to stop. When the lights come on with every application of the brakes, your time is short.