Inverse head and shoulders - a question

Hi Ann
There's no time limit that I'm aware off.
I think it should be a sensible figure thou as too long will most likely make it fail.
The bigger the time frame ( within reason)the bigger the move.
I'll say within a year from start to finish.
But longer is possible.
Just my view thou

Sorry - the symbol in the column should have been a question mark! Apologies!

Can anyone tell me - if such a rule exists - how long it takes for an inverse head and shoulders pattern to form? Can it happen in a matter of days, or does it take weeks, months even??

Thank you
Anne