Hi @Jan_Répal ,
This is a tricky one indeed and the below are some workarounds which perhaps you have already tried but it depends on what suits you best:
1. Create a Column or Lollipop chart like this:
(the X-axis is via ‘Time period>Month’ (available on Business)
(the Y-axis is via ‘Time entry>Actual time’
This will provide the TOTAL hours tracked by ALL MEMBERS on a monthly basis - perhaps not what you want…?
2. Create a Column or Lollipop chart like this:
(the Y-axis is via ‘Time entry>Actual time’
(the filter is via 'Date>Time entered date
This will provide you with the total hours tracked by EACH MEMBER over the past month - perhaps this is what you are looking for…?