Board Thread:Naruto Discussions/@comment-25442710-20140920121351/@comment-4271790-20140920123429

Elveonora wrote: That wasn't stated anywhere though. And it took many years for Madara to get Rinnegan even tho he had the chakra. Wasn't stated? It was shown by Sasuke and Madara. Both had the EMS and Hagoromo's chakra to awaken the Rinnegan. It took Madara years because the portion he got from Hashirama was too small, and took a while for Asura's chakra to grow and merge with Indra's. Sasuke directly got chakra from Hagoromo, already merged and such.