Also your source is a an anonymous poster.
My links are less than 1 year old in a google search.


http://www.bairdfinancialadvisor.com/theliles...ctions.pdf
Form 144 Filing Requirement
The affiliate must file a Form 144 prior to the sale if the amount of restricted stock the affiliate intends to sell over a
three-month period is at least 5,000 shares or $50,000. The Form 144 is valid for three months. A new form must be
filed if the affiliate intends to sell stock after this three-month period expires .


https://www.rule144solution.com/faq/
How long is the Form 144 good for?
For an affiliate of an issuing company, each Form 144 is good for three months from the filing date . If any “restricted stock” is not sold at the end of the three month period, it can be included in a new Form 144 filing (still limited to one percent of the issued and outstanding or average weekly trading volume, which ever is applicable). If not covered by a new filing, the unsold shares must be returned by the broker to the transfer agent for the reissue of new certificate with a restrictive legend.