I'm not sure where that idea came from ?
The Bible lists several people who where raised from the dead/brought back to life.
After Elisha the prophet died, he was buried in a cave or tomb. Moabite raiders attacked Israel every spring, one time interrupting a funeral. Fearing for their own lives, the burial party quickly threw the body into the first convenient place, Elisha's tomb. As soon as the body touched Elisha's bones, the dead man came to life and stood up on his feet. The men who tossed the body in Elisha’s tomb observed the man raised from the dead and spread the story far and wide.
The Shummite woman's son - restored to life by Elisha the prophet.
The widows son at Zarapath - brought back to life by Elijah the prophet
Lazarus had been in his tomb for 4 days before he was raised by Jesus.
Our Lord had been in his tomb for 3 days prior to his Resurrection.
Tabitha - restored to life by the Apostle Peter.
Eutychus - fell out of an upstairs window and was pronounced dead. He was restored to life by the Apostle Paul.
If people want to believe that someone came to life after a month they are free to do so, but it isn't physiologically possible as putrefaction would be well-advanced by then.