Approval trigger issues or what is the time to wait before run the next step

Hello, what is the time by default that the workflow wait to RUN the next action? I have several issues with this worflows… and the time is very randon to execute correctly the workflow… and the indicator’s approval step always shows : PAUSE, but the steps working sometimes… or What is wrong in my workflow?

and I receive both email… before and after approval STEP (true), without interaccion