Thanks for your reply Mattias.
It depends, most of the time it is the same artist working on the task.
Ofc. I could change the duration of a task without adjusting the bid days but that means
I don't see if an artist is free to take over something else. As an example if I have 2 bid days for a comp task
but due to waiting times for feedback, new renderings, plates whatever the end date could be 10 working days later.
So the artist would be blocked, according to the gantt charts, for 10 instead of 2 days....