Okay I would suggest that
On weekly basis during initial days of therapy. One session each week.
Where the client would get enough time to work upon the task provided as well as on their skills..the sessions held each week should be the main session.
But if needed one or two follow up sessions can be scheduled in a week as per the need of the client.
Otherwise I would suggest one session every week untill the need subsides.
Once the client starts to get back on track then sessions can be aligned accordingly. Which can be once in two week and so on.