How many candle need to close above support to determine support that could not be broken?
How many candle must close above resistance to determine breakout of resistance?
I don’t think its so much as how many candles determine the power of the line but rather what price is doing around those lines and then setting your trades accordingly.
For example, a bearish hammer right on the resistance line is a strong indication that price is turning around (of course, the probability is higher on a higher timeframe).
It only takes one candle to break support/resistance. Also, it is better to think of s/r as zones rather than actual price levels.