How can I know the number of computing hours consumed per project?

You simply need to use the IDRIS command idracct to know the hours consumed by each collaborator of the project as well as the total number of hours consumed and the percentage of the allocation.

Note that the information returned by this command is updated once per day (the date and time of the update are indicated in the first line of the command output).

If you have more than one project at IDRIS, this command will display the CPU and/or GPU consumptions of all the projects that your login is attached to.