Level 655
Answers
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Best place to check is the Wiki page (http://candycrushsoda.wikia.com/wiki/Level_655) It used to be 40 but seems to have been changed to 30 at some point.
The videos you've watched must have been recorded before the changes were brought in: https://care.king.com/en/candy-crush-saga/changes-to-levels-number-of-moves-etc-320938520