Special relativity gives every mass in the universe its own clock. I have one, you have one, and every planet has one, but they only keep the same time if they have the same speed. General relativity adds that gravity alters time as well, so it slows down near a large mass like the earth. Hence it takes a lot of computing to make GPS navigation work because the clocks of satellites tick at a different rates depending on their altitude and speed.
How then does gravity change time? In this model, time ticks by as network cycles complete, so time will run slower if fewer cycles complete, and increasing the load does that. The gravity gradient around the earth increases the network load closer to earth, which slows down time. A clock on top of the Empire State Building then runs faster than one at the bottom because it completes more life events.
Would we live longer on a planet with more gravity? To others it might seem so but to us, time would pass as usual. A larger planet dilates time relative to earth but the number of life events in our lifetime wouldn’t change.
Gravity then slows time as Einstein says, but just as a side-effect of slowing down the quantum network. We feel gravity as a force, see space as an extent, and measure time as events passing, so that they relate as relativity says isn’t unthinkable, but it is inexplicable. However, if what we observe comes from what we can’t observe, as quantum theory explicitly states, gravity, space, and time are effects not causes, all caused by the same quantum field.