The pump should not take longer than a few minutes to bring the pressure up to normal if everything is working properly.
How is the water pressure? It sounds like the system is not pressurizing fully because you have a leak. If this is the case it is likely that the drop pipe in the well is leaking. It is also possible that the water level in the well has dropped to a point where the pump is not getting any water.
Allowing the pump to run too long when it is not moving water will cause it's demise.