In the nestle payout chart, the payout dividend is constantly increasing..for how long should I observe before saying its a good and stable dividend?

I dont think theres an absolute rule, but check for times of global market stress / consumer staples industry stress and see how the management responded in terms of dividend declared. Also, check that the dividends are less than the earnings (some companies ensure a dividend yield by paying more than their earnings, dipping into their cash, which is not sustainable)