Minimum/Maximum amount of an order on OLO under throttling settings

Throttling settings should have a condition of minimum/maximum amount of an order for OLO.
For example - if an order is under 50$ then the estimated time of preparation should be set to 10 mins and if the total order amount is over 50$ then the estimated time of preparation should be set to 20 to 30 mins. 
Requested by El Pato.