Board Thread:General Discussion/@comment-27379005-20180829033253/@comment-40062969-20191005162431

Gameplay feats shouldn't really be disgarded though unless there's reason to, especially since that manual confirms what Sonic needed to do to time travel when using the signs. It's not even the only case of official sources saying he can go at such speed either.

He should be several times the speed of light going by the Sonic Unleashed SPD thing vs light speed dash. Somewhere under ten times. Base wise, anyway.