Maul is the only one here who will put up a decent fight. His style is at least refined enough to where he can contend with the acrobatics of Yoda.
Ventress's "sloppy" style of Makashi would be easily deciphered by Yoda if she isn't TKed into commission.
Savage wouldn't last a second with his barbarian hack and cleave style of fighting but I doubt he would be forced into submission by TK attacks as seen when he fought Dooku.
Grievous is all attack and no defense. That's the last thing you want to do with Yoda. He'll his arms falling to the ground pretty quickly. Again though he won't be TKed into submission.
So in conclusion:
Maul might last as long as Dooku did with luck
Ventress might get a few strikes in but she'll find herself disarmed pretty quickly either through TK or dismemberment.
Savage gets his head chopped off the quickest
Grievous doesn't realize that his limbs are missing until he finds himself on the floor.
Numbers don't matter here as only Maul has the skill to last against Yoda for sometime by himself. The rest would get tooled.