The 7 day waiting time to get the delegated SP back is there because you could abuse the system if its lower. Lets make an example with hmmm 3 days until it would return: I could use 100% of my voting power and then delegate all my SP to another account and on this account . After that I undelegate and get the SP after 3 days back. So in 3 days I used 200% voting power and have recovered 60% of it already. So I could do it again with the 60% over and over again and use 120% voting power instead of only 60% and in the end that would double the upvotes.
Thats why there is a 7 day cooldown

Posted using Partiko Android