Share 'How long in the field-Fieldwork for Unit4A?'

Just starting to think about the 'post AS' phase of the AS year- reading the spec information I cannot see any guidance on time required in the field. With the old AQA A2 the spec stated '2 days in the field'. Does anyone know whether this is still the expectation for primary data collection, or whether 1 day would be sufficient? Any thoughts welcome!