Let's say hypothetically, there was a marathon of all of Bob's daytime episodes. Let's do some math:

Judging by

Steve Gavazzi's season-by-season episode count that he recently posted and his FAQ, there were 6,731 episodes in TPiR's first 35 seasons. Of those, Seasons 1-3, 8 of the first 9 weeks of Season 4, 16 episodes throughout Seasons 4-7 (for CBS Magazine), plus another 6 episodes from 1984-1994 (for the Pillsbury Bakeoff) were all half hour episodes.

There were 736 episodes in Seasons 1-3. So, 736 + 40 + 16 + 6 = 798 half-hour episodes, which leaves 5,933 hour-long episodes.

798 * 22 minutes = 17,556 minutes, 292.6 hours, or 12.19 days

5933 * 42 minutes (an average of run times from 1975-2007) = 249,186 minutes, 4,153.1 hours, or 173.05 days

This means that it would take about 185 days for every Barker episode to run back-to-back with no commercials.

Of course, there's the tiny matter of converting all those tapes, which will probably take something like 25 years, at the rate they're going with Buzzr.