TheStreet.com TV Recap: The Crucial Last Half-Hour

There's a rhythm to the recoveries in the stock market, Jim Cramer said on TheStreet.com TV's Wall St. Confidential Webcast Tuesday.

Cramer believes "this market will be determined by 3:30 p.m. to 4 p.m.," he told Gregg Greenberg, the host of Wall St. Confidential. Therefore, if people are buying now, they have to understand they might have to buy more today, he said, adding that 3:30 is a "crucial" time because that is when the buybacks stop and it's really easy to knock the market down.

Cramer said those of the bearish bent may try to spread rumors, particularly between 3:15 p.m. and 3:45 p.m. today.

Although it's against the law to spread rumors, Cramer said he knows people do it, because there was a time when he used to hear the rumors. He, however, did not spread rumors himself, and being a "very high-profile guy," he would be "too easy to take down."

"It was the enforcement side that kept me from doing it, not the ethics side," Cramer said. "The ethics side is very thin in the hedge fund business."