HI Prem,
system will take the Time Unit from the Work center it may be in Minutes are Hours..
EX : Base Quantity is 10 in Routing and the machine Time id 1 hour so it means to process the 10 quantity the machine take 1 hour.
so if we raised the production order for 100 quantity system will Multiplies the 100 quantity based on the Machine time for of the base quantity and formula in the Work center.
system checks the working hours of the work center which we maitain in the capacity tab of the work center based on that it will proposes the times in prd ord.
regards,
mahesh.