I think you put your question in my quote above.
In an ideal world you would do the clinical phase with one course, then when that course takes off to do PCP phase in BC you would go directly to another course that is just coming back from PCP phase in BC and do the field phase with them.
It does not always work out quite as well as that and you might get stuck in PAT (person awaiting training) cycle between your clinical phase and the next field phase. During this time you will have Training Centre duties (work as "patients" for another clinical course, work in stores or the QM, work in the canteen, work in the library, work in the kit shop, work doing memorabilia maintenance, work helping with IT, and/or going to the field as general duties staff for other courses), personal training (PT and guided studying) and if you are lucky get military driver training. It is also possible if the gap is going to be extensive that you will get loaned out to a Canadian Forces Health Services Centre to get some real clinical experience.
No vacation between phases. Even if you are already qualified PCP. My recommendation if you get "stuck in the suck" make the most of it, stay motivated and physically fit, do not become an administrative burden, and pick up as much experience as you can before your field phase and first posting.
MC