Drip time intervals are relative to the last step. Consider this scenario:
- Step 1 - send 1 day after starting the campaign
- Step 2 - send 1 hour after step 1
- Step 3 - send 2 days after step 2
Step 2 will be sent an hour after Step 1, Step 3 two days after Step 2. Making the total campaign time 3 days and 1 hour.