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Big Brother 1 USA aired six times a week.

Mondays, Tuesdays, & Wednesdays were 30 minute daily shows at 8/7ct.
Thursdays were the hour long live show with Julie. One week it would be nominations and another week it would be banishment (eviction)
Friday was a 30 minute daily show.
Saturdays were an hour. The first half hour a recap of the entire week and the second half hour a daily show.

Big Brother 1 averaged about 9.1 million.
Big Brother 2 averaged about 10.3 million.
Big Brother 3 averaged about 10.6 million.
Big Brother 4 averaged about 10.2 million.
Big Brother 5 averaged about 9.8 million.
Big Brother 6 averaged about 9.3 million.
Big Brother 7 averaged about 8.1 million.
Big Brother 8 averaged about 8.2 million.
Big Brother 9 is currently averaging 6.1 million live viewers.

Whenever you factor in DVR ratings though ratings go up about 30%.
Big Brother 9 (with that included) is averaging 6.5 millon (thats only for the first 9 of the 17 eps aired so far though).

Still Big Brother 9 is rating the worst of all.