D.C. Personnel Director George Harrod said yesterday that mayoral assistant Joseph P. Yeldell, who has requested annual leave status to help prepare his defense of conspiracy and bribery charges, has accumulated 660 hours of annual leave time.

Harrod said the total - which amounts to more than 16 weeks - stems from a combination of "carry-over" and other unused leave time amassed by Yeldell over the last several years.

Yeldell, then a general assistant to Mayor Walter E. Washington, was indicted last Thursday in U.S. District Court along with parking magnate Dominic F. Antonell jr. on charges of conspiracy and bribery in an elleged city leasing scheme.

The mayor immediately placed Yeldell on administrative leave with pay. Several attorneys familiar with personnel procedures questioned whether Yeldell could remain in that status for more than five days, however. On Saturday, Yeldell formally asked the mayor to shift him to annual leave status although he did not suggest in his letter to the mayor that the requested shift was due to the possible time limit on administrative leave.

At the time Sam Eastman, spokesman for the mayor, said Yeldell told him he had about 700 hours of accumulated annual leave.

Personnel Director Harrod said yesterday the exact amount was 660 hours broken down this way:

240 hours of "carry-over" leave time, the maximum permitted under federal and local regulations. A government employe who declines, on his own initiative to take all his entitled leave each year, may carry over a maximum of 240 hours of leave for use in future years.

218 hours of "restored leave" from the 1975-76 leave period, and another 160 hours of restored leave from 1977-78. Restored leave occurs, for example, after an employe is denied requested annual leave on the grounds that he is considered essential or indispensible in his work. He is permitted to gain back or "restore" that leave time within the next two years.

42 hours of normally accrued annual leave so far this year.

Harrod said yesterday that he was not certain whether Yeldell's restored leave was based on a finding of indispensibility. But other District Building officials said the mayor denied Yeldell annual leave both when Yeldell headed the department of Human Resources and more recently when he became general assistant to the mayor.

Neither Harrod, Eastman nor City Budget Director Comer Coppie said he had specific documentation of Yeldell's leave status immediately available. Coppie said Yeldell's request for 160 hours of restored leave in 1977-78 was still awaiting approval in his office.

Karen Benefield, administrative aide in Yeldell's office responsible for such matters, could not be reached late yesterday.

One source close to the mayor said Yeldell was not likely to request all 660 hours of annual leave at one time but to seek it in increments of perhaps two or three weeks at a time.