Board Thread:Theories and Speculation/@comment-45444155-20200728155230/@comment-3523655-20200731085049

To follow up on that:

Jugo can't enter Sage Mode but can use Senjutsu (I stand corrected, my bad) and Senjutsu chakra.

Your question: how can one use senjutsu chakra without logging into sage mode?

The answer: The same way Jugo and Orochimaru can. Either a kekkei genkai, or, well, the Curse Seal. Or the mysterious way Orochimaru does it.

The manga says Senjutsu Chakra is necessary to enter Sage Mode. Read it again. Senjutsu Chakra is not the same thing as Sage Mode, it's a necessary component to reach Sage Mode.

And no, it's not going to take a long time, because this concept is not that complicated to grasp. The trouble is getting people to stop responding to your troll ass.