There can’t be a right answer to this.
I was watching a clip recently where the guy had a support line from a 1985 low connecting to a 2019 low on a weekly chart. This obviously represents a feature starting over 1700 bars back across 34 years - quite incredible. But he was quite certain this support is about to come into play again.
He might be right, he might be wrong. It almost doesn’t matter because the s/r line is drawn to help him plan his trade, not to predict what the market will do. He draws the line to gauge his risk tolerance: once its in place, he can work out a stop price, and from that a target price, and from these position size, pyramid price, position cut price, re-entry prices, etc. etc.
S/r lines are guides to your trade, not a diagnosis of what the market is going to do.