A trading range is defined by 21 or more bars, where bars 21 through 29 historically have the best chance to break out of the range.
When looking at the 1 hr. chart (EUR/USD), the range is currently on bar nr. 27
If the range trades beyond bar 30, chances are that a trading range will build on the 4 hr. chart.
This rule applies to any chart time-frame.
Often price congestions start and end with a doji-bar. 2 in a row can be seen on the 4 hr. chart (last 2 finished bars)
"a little bit of knowledge is a dangerous thing"