Does it say Continuous Duty in the generic manual like, say, here https://www.franklinwater.com/products/submersible-motors-and-control-boxes/4-inch-submersible-motors/4-inch-induction-motor/4-inch-2-wire-single-phase-models--sku-collection/2445581203gs/
How much load you put on it is a factor but it should run at rated capacity, say, 7gpm at 450ft head. Depending on model.