Formula field for Date/Time to compute 24 hours.

So basically I'm just creating a formula for a formula checkbox that will be true if the date/time field is greater or equal to 24 hours from now and less than or equal to 36 hours from now. I'm using the formula below:

AND(

Go_Live_Call_Date__c >= now() + 1,

Go_Live_Call_Date__c <= now() + 1.5)

I'm not sure if this is correct though. Is 1.5 the direct translation for 36 hours?

Any suggestions or answers is greatly appreciated.