RICHMOND, SEPT. 22 -- Democratic Gov. Gerald L. Baliles said today that Republican Sen. Paul S. Trible, who might be eyeing a race for governor in 1989, "may have the wrong idea about the time it takes to be a governor."

Trible is wrong, Baliles said, "if he thinks it's a 9-to-5 job."

Baliles was responding to statements by Trible that while he wants out of the United States Senate because it is so time-consuming, the job of governor might be easier on family life because the office and residence are next door to each other.

"Unlike Congress," the governor said, "our work week is not Tuesday through Thursday," and "I don't get all those federal holidays."

On checking his calendar from last week, Baliles said his schedule allowed him to have breakfast at the governor's mansion on Monday, Tuesday and Saturday, lunch on Monday and dinner on Wednesday and Saturday.

Baliles also rattled off a list of recent official trips -- a budget tour of the state, a transportation tour, governors conferences in Michigan and Kentucky -- in addition to an upcoming trip to the Far East, his third out of the country this year.

"I even lost four days of a seven-day vacation" by being called back to the capital, Baliles said.

A governor's duties are "ceremonial as well as executive," he said, with his office getting an average of 135 invitations a day to appear at ribbon-cuttings and dedications.

Bitterness over Trible's decision to give up his seat, whether for family reasons or fear of an expected challenge from former Democratic governor Charles S. Robb, remained.

At state Republican headquarters, damage-control measures today included a statement by party Chairman Donald W. Huffman that Trible "will meet all of his scheduled commitments to campaign on behalf of our 1987 General Assembly candidates."

The statement also indicated that the GOP is hopeful Trible will share part of his $1.4 million campaign war chest with state and local candidates.

Trible "has been generous with his time and campaign funds," Huffman said, "and he and his staff are investigating the legal options" of whether money collected for a federal campaign can be turned over to state races.

If Robb decides not to run and Republicans still lose the seat, "Trible's history," said House Minority Leader R.R. (Andy) Guest Jr. (R-Front Royal).

Army Secretary John O. Marsh Jr., mentioned by Trible and others as one of a number of possible Republicans who might run for the vacated Senate seat, issued a statement saying that while he was flattered, he would not be a candidate.