That depends on the wound and immediate response.
12 years ago my son severed his femoral artery in his upper thigh with an electric hand saw.
He was alone in a house he was renovating, standing chest deep in a hole in the wood floor cutting some framing when the saw hit a nail and kicked back.
He pulled himself out as quickly as he could, laid on the floor with his leg propped up on a box, then took off his belt and used it as a tourniquet around his upper thigh. He dialed 911 on the cell phone we had given him just a few months prior (his wife, a hippie Luddite, had been very reluctant to use such gadgets) and waited for the EMS which luckily was stationed only 3 or 4 blocks away in North Austin.
When the responder crew arrived and walked in the door, one of the guys looked at the blood sprayed all over the floor, walls, & ceiling he exclaimed loudly, ”Holy shit!”. The ensuing ambulance ride out of the neighborhood down to Brackenridge Hospital was a miserable pain every time they went over a speed bump.
But son owes his life to those EMS responders and the wonderful staff in the ER. Plus his own Boy Scout training.
After the surgery the doctor said he had bled out at least three liters, and was surprised he had not gone into cardiac arrest.
Son was still white as a sheet of paper when we saw him in the ICU.
It took 6 months for him to recover full use of his leg and get back to normal.