Idea is to create a Wait Flow Action Token that includes duration (and all the other options you get in the Wait flow step at the Smart Campaign level), then enable the Wait flow step to use this new token. Right now, the only token you can use in the Wait flow step, is Date.
A Wait Flow Action Token like this would make it MUCH easier to set up nurture flows that have multiple Wait steps that are all the same duration, e.g. "5 days and wait must end on Mon-Fri at PDT."
A Wait Flow Action Token would also help save time re: testing. Right now, for example, when we compress wait times to 1 hour for testing purposes, we have to go back in after testing is done and change the Wait steps in 12+ Smart Campaigns.
With a Wait Flow Action Token we could set it once at the program level and it'd be done, and later if we decided to change all the wait times then we'd only have to change the Wait Flow Action Token.