Weathering

You utter an incantation to hasten an objects path through time. causing metal to rust, food to decompose, or liquids to harden. For instance cutting fermentation time in alcoholic beverages or hardening concrete.

you may turn forward time of any nonliving object or area that is no larger than 5 square feet by a day 

for each spell slot over the first the size increases by 5 square feet and time doubled for each spell slot (for instance casting at 2nd level will be able to effect an area of 10 feet and forward time 2 days, while at level 4 it will effect an area of 20 feet and forward time 8 days)