The Hanafi and Hanbali view discussed sets a minimum of about one month. The Maliki view mentioned requires at least about fifteen days. Their reasoning is that Salam was meant to give producers meaningful time and that a real time gap may affect pricing.
Other jurists, including Imam al-Shafi‘i and some Hanafi jurists, do not impose a fixed minimum. Their focus is that the delivery date must simply be clearly known.
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Advance-Purchase Sale (سَلَم): Availability, Delivery Time and Financing Use
The Hanafi and Hanbali view discussed sets a minimum of about one month. The Maliki view mentioned requires at least about fifteen days. Their reasoning is that Salam was meant to give producers meaningful time and that a real time gap may affect pricing.
Other jurists, including Imam al-Shafi‘i and some Hanafi jurists, do not impose a fixed minimum. Their focus is that the delivery date must simply be clearly known.