Do showing of interest cards expire? July 28, 2021 21:07 Yes. A showing of interest is good for up to six months from the date signed. Related articles **NEW** Section 292.675 requires 10-hour safety training stipulations in all public works contracts. Does Section 290.230(5) (that exempts public works projects valued below $75,000) have any impact on this requirement for training? What is a "Showing of Interest"? Who gets to vote in a certifying or decertification election?