Here are some more up-to-date (1999) figures: The requirement for the average publisher is still one full hour, except for those who are infirm or elderly and cannot get a whole hour in. Those people can report in quarter-hour increments and still be regular publishers. Everyone that they feel could turn in a full hour is still expected to do so, and will be hounded and harassed unless they can get substantially more than that.
Sometime about 1999, they lowered the nominal requirements for auxiliary and regular pioneers. At that time, they lowered regular pioneer hours from 1,000 for the year to 840 per year (that translates to 70 hours a month). The original 1,000 hours a year translates to 83 1/3 hours per month, though many used 90 hours to inflate the requirements and so they could take it easy in summer. Auxiliary pioneers were reduced from 60 hours a month to 50. Time will tell what will happen to those numbers once the Kool-Aid Puketowers start coming out.
A side note. Back in the early 1940s, they were saying how special pioneers needed to get 175 hours a month. Regular pioneers needed 150, and they expected the average publisher to get in 60 hours a month. They also required 12 backcalls per publisher and 50 per special pioneer (the regular pioneers were to get as many backcalls as they could handle). Anyone with original literature from that period can attest to it, as can anyone who was a Witless or had parents who were Witlesses during that period. The major issue is that, if they did it then, what's to stop them from doing it again once the Puketower starts its Kool-Aid edition? Nothing.