Typically the entire process needs minimum 2, maximum upto 4 such calls.
What I try to cover overall is:
Understand how could a portfolio be created
What should it cover
Get at least a couple of examples.
The First call usually covers:
Understand Your background [30min]
Understand What all have You attempted so far [10min]
Provide You with Ideas on what can you start doing as the first step [20 min]
Covered in subsequent calls:
Gaining momentum on LinkedIn (Popularity)
Be a person showcasing Your Skills and readiness to the world by ProActively showcasing your strengths (rather than waiting for recruiters to provide you with JD and responding, etc.).