He says to save 1 years worth of living expenses, and then start investing. He used to say save 6 months.

https://www.marketwatch.com/picks/mark-cuban-has-repeatedly-given-this-simple-piece-of-money-advice-and-its-more-lucrative-to-do-it-now-than-it-has-been-in-over-a-decade-01664393871?siteid=yhoof2