Same result, it shows that it is all send at once and the Time value is ignored.
Also tested it with 2 hours in between, same result, all was send directly.
Does "after-campaign-sent" has no use when you use Autoresponder time unit?
To be sure, this is the general idea:
When message 1 is send, send message 2 after 7 days.
I assume "after-campaign-sent" means that when campaign 1 is send, to the action of campaign 2 after set Autoresponder time unit.