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If we had a snail's pace (with no extra acceleration or deceleration) the difference in the clocks would be similar or identical but ,as an example it could be a billion years as against a billion and one years , depending on a great distance and a slow speed.Make sense? It only stands out as remarkable when the speeds are relativistic.

Show me where. It is, but show me where cosmological redshift is interpreted as a decrease in frequency then. This is how the FLRW fits observations of cosmological redshift and interpretation of it as space expansion. You can't use a parametisation to prove it's assumptions.

It is the equation. a(t) = V(t)/s(t)^2 or miles/hours^2 aka mph^2 Position=S(t)->(distance over time) Velocity=v(t)->s(t)/time Acceleration=a(t)->v(t)/S(t)->distance/time^2 Time squared, yes it is covering the same distance over more time. Hence the outside world is experiencing a greater passage of time. Whether or not the observer is experiencing more time as well is a matter of debate. We really can't go fast enough to tell.