The College of Contract Management’s Level 6 Diploma in Site Management will take anywhere from 2 months to 2 years to complete. Any NVQ levels that are higher will potentially take much longer due to the more prestigious qualification. Additionally, you will need the preceding level of NVQ in order to progress to higher level.
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https://www.theccm.co.uk/courses-page/nvq-level-6-construction-site-management/