Time moves forward constantly at the speed of light, bringing everything with but when an object approaches sea, the universe struggles to facilitate its travel through time. Similarly, time dilation is experienced near a black hole because there is so much information being processed in such a condensed space. Time does not traverse distance, much less traversing distance in any particular amount of time. The answer is always, one second per second. I literally wrote that in my draft for the biggest ideas book just the other day. There's literally no other rate at which it possibly could flow at.