Time likely exists because there are (most likely) functions that can only be calculated in iterative recursive matter.
I.e. to calculate F(t_x) you have to go through all the steps: F(t_x) = f(F(t_x-1)) all down to F(t_0) (initial condition) and there is no shortcut to calculating it (quickly) directly.
Universe is like a large computer doing calculation of some such function and its steps are what we perceive as time.
I.e. to calculate F(t_x) you have to go through all the steps: F(t_x) = f(F(t_x-1)) all down to F(t_0) (initial condition) and there is no shortcut to calculating it (quickly) directly.
Universe is like a large computer doing calculation of some such function and its steps are what we perceive as time.