Sending Emails in working hours

I am sure other members of the community can come up with other ways but the first thing that comes to mind is to set up a custom field that adds a time stamp when the trigger fires and then use that time stamp to route the lead to (A) a campaign to send the email if the time stamp is between 9-5 or (B) to another campaign which waits until 9am the following day is the time stamp is outside of the 9-5 interval.

Hey Arunkumar, you can get the campaign to only flow Mon-Fri at 9am if you have a triggered campaign that has a wait step such as this:

But to only allow it to be triggered between 9am and 5pm would require more of a workaround, and unfortunately isn't simple to do.