Thank you Stéphane, for your answer.
You're right, each task should be divided into smaller tasks. But in this case, one of the tasks is "debugging", and this task will take me some hours.
And each day, I like to split and work on each project, so I only have 1 hour to work on this debugging.
That's why I can't split it into other sub-tasks, but on the other hand, I can't do this debugging in one day.
So what I do is that I debug but I can't check anything in MLO, and I can't see that I progressed in the project...
Anyway, I'll go on doing like that.
Thanks again for your help.
Véran
PS: are you french ?