Check with your local authority. Even in EASAland there are huge differences. Many countries do not take the UKs very relaxed attitude towards PICUS and allow it only in certified courses, usually only during upgrade training or a pre-upgrade period with line trainers only. For real PICUS it doesn't matter if the pilot is PF or PM, both roles have to be done equally.
Then there are some authorities that only issue PIC and COP ratings. To fly an ATPL check with those kinda ratings it has to be done from the left seat in order to get a PIC rating, which requires additional training that will usually not be funded by the airline except during a command course.
I would say with the current progression average hours to ATPL in my company are roughly between 10.000 and 15.000+.