It depends (you can’t be surprised by that answer!). If the organization is small, properly prepared, and being assessed against Maturity Level 1, the assessment might be conducted by a single assessor who only requires a day or two of preparation, a day on site to conduct the assessment, plus a day to prepare the corresponding Assessment Report. By contrast, a larger environment spread across multiple sites and being assessed against Maturity Level 3 may require an Assessment Team comprised of multiple Assessors and the preparation, on-site, and reporting times are likely to significantly increase compared to a small ML1 assessment. The more complex the environment being assessed, and the higher the Maturity Level, the more expensive the assessment is likely to be.