That's usually allocated in scattered hour or half-hour blocks, depending on my schedule for the day.

Mr. Clinton and Ross Perot bought half-hour blocks of time for network television appeals.

Clinton campaign officials are negotiating with the networks to buy half-hour blocks of time just before Election Day for more kinder, gentler advertising.

Net Nanny administrators can schedule times in which a user is permitted access, in half-hour blocks.

All cable TV companies reserve one channel for an endlessly scrolling list of which programs are scheduled on what channels for the next hour and a half, in half-hour blocks.

The program varies in length, with one half-hour block focusing on the music of one particular year.

And if President Bush and Gov. Bill Clinton are not rushing to buy half-hour blocks of network time, experts say they probably have a good reason.

As a result of the unspent cash, the Obama campaign purchased half-hour blocks of programming time on three of the four major U.S. television networks.

The Zelda episodes were cut for time when aired in the Video Game Masters package and two episodes were shown in each half-hour block.

Mr. Perot also noted that he had repeatedly sought this year to buy half-hour blocks of prime-time television on the major networks for "infomercials" about campaign finance and other topics.