Board Thread:Naruto Discussions/@comment-24165784-20151108230957/@comment-734582-20151123135523

Bob1200 wrote: It Took A Super Long Time For Hiruzen And Minato To Seal Their Targets, lol. Hiruzen sealed Tobi and and Hashi in seconds. Minato was purposefully delaying RDS. If you complete RDS you die instantly. So he held it off to talk to Naruto, to set up the sealing of Kurama into him too and putting his own chakra and Kushina's into the seal. He couldn't wait with RDS because Kushina was getting weak, so he performed RDS first to suppress Kurama with it. Against Orochimaru it was clear that being sealed suppresses all your abilities so once hit by RDS, being able to perform Izanagi is impossible.

By the time Hiruzen was at Orochimaru he was already near defeat and had already sealed two targets. It's a small miracle he could seal something of Orochimaru at all.