We are soon migrating to Gen3 with TimeBill module (on Gen2 we were using TimeCost).
For most of our users, the regional setting for decimal separator is , (comma). In Gen3 it seems that the decimal separator is . (period). That'll generate an issue for users: first, they need to learn to use period as separator. Second, if they would like to export a report to excel, they'll have problems with hour calculations (replacing period with commas generates an additional step).
The optimal solution would be that a user could set the decimal separator for himself (we have persons from different areas with different regional settings as well).