I'm sure this has been mentioned before but I thought I'd share it as it's a useful tip.

Ontime is set to work woth 8 hour days, we work based on a 7 hour day so when we were entering 1 day estimated time against a feature for example, the reports and Dashboard would calculate the number of hours incorrectly.  We found that by editing the TimeUnitTypes table in SQL Server and changing the value of the ConversionFactor field we could make OnTime work with a 7 hour day.  All you do is enter the number of minutes that makes up a day in the ConversionFactor field and hey presto!