When running "Insolation wizard" and selecting "Shading, overshadowing and Sunlight Hours" and total insolation hours for the given date the desired precisity is a minute (or at least 1/10 of hour).

It is important issue required by all building codes that were developed on the basis of Soviet "SNiP 2.07.01–89" (for example Latvian "LBN-100") that requires 2.5 hour(with informalities) insolation in living rooms at Spring solstice. In historical dense urban areas and northern lattitudes there is a need for much greater preciosion than the round hour.

In general I think that the precisity of units of Analysis Grid should be more customable. For example - if illuminance levels are calculated to achieve 300lx, there is little interest in the decimal parts of luxes.