Single sessions, called intervention sessions, I recommend for working on challenging goals, achievable in a short period of time, for highly motivated people.
For more complex situations, requiring work over several weeks, months or even a year – I recommend packages of 6-12 meetings. This way you invest and Secure your resources to work on yourself. You do it in a planned, structured way.
In achieving complex goals, lowering commitment is a critical obstacle to success.
I compare it to visits to the dentist:
When it hurts we walk and heal, when it stops hurting we consider the problem solved.