It really depends on where you live. What satisfies one jurisdiction might not satisfy another, even with similar soils on a lot divided by a state line.
Generally, you 6" per hour works out to 1" in ten minutes. That should be quite acceptable in most jurisdictions, but it begins to border on being too fast for septic disposal. Your 1" per hour is acceptable in many jurisdictions.
Many factors play into the determination of adequacy for septic disposal on a lot. Soil type, perc rate, and seasonal high groundwater are the top three. When the conditions on a lot meet what the jurisdiction considers ideal, the system design is fairly standard. As the conditions of these three recede from what the jurisdiction considers appropriate, in either direction (fast or slow) the size of the system and the field may increase. Beyond a certain point, there may be nothing that can be done to make a lot pass the test, thus it may be deemed unbuildable.
If you had a lot that sat squarely on, and was divided by the borders of Massachusetts, Connecticut, and New York, you find that the acceptable perc rate would vary from 1" per 30 minutes, to 1" per 60 minutes, to 1" per 100 minutes.