Amount of training and volume of learning
Related, frequently conflated, and both assessed.
Volume of learning is a framework concept describing the notional duration of a qualification including all activity. Amount of training refers to what the provider actually delivers. They are different figures and both are examined.
The recurring question is whether a compressed delivery is permissible. The general answer is that the amount of training must be sufficient for the learners in question, which makes it a judgement the provider must be able to justify rather than a fixed number.
Justification usually rests on the cohort: prior skills, existing experience and recognition already granted. A compressed delivery for experienced workers is defensible on that basis and the same delivery to school leavers is not.
The evidence expected is documentation of that judgement at the point of design, not a post hoc explanation. Recording who the delivery was designed for and why the duration suits them is the artefact that answers the question.
Funding contracts frequently impose their own minimum durations that are stricter than the standards, and a provider satisfying the standard can still breach a contract. Both have to be checked.
The other duration question providers ask is whether prior study or experience can reduce the amount of training. It generally can, and it is recognition rather than compression, which means it has to be assessed and documented as recognition rather than assumed from a cohort description.