Due date for Queues

Ok I am a bit new to RT so forgive me

I am running 4.0

Requests should be due in 0 days… Is there anyway to change this to hours?

I see how I can automate priority change using rt-crontool then use scrips
within the queues to email the right people when it changes priority… I
just need to know if I can make requests be due in hours instead of days