@stringify4- Some of the Things have a timestamp as a parameter that can be used by the the next Thing, but just to view or store it. The real problem is there currently is no way to compare two timestamps.
If you just need to see if it has been more than 5 minutes, then use a separate flow with a 5 minute timer which sets a variable to true when 5 minutes is up. That flow would have a Connect Flow Thing as a trigger. So if variable timesup = true then Alert "Motion" and Set Variable timesup to false. Then whether the variable was true or not, always use a connect flow to start the timer flow, in case it isn't currently running.
Note- a timer can't be stopped or reset and a flow with a running timer can't run again until the timer is done. So when the Arlo flow tries to start the timer flow nothing happens if the timer was already running. But you need to do it just in case it wasn't running.