Commodity derivatives contracts in India expire on different dates depending on the commodity. For example, gold futures expire on the 5th of the expiry month, which is usually bi-monthly, while agricultural futures expire on the last day of the expiry month, which is usually monthly. If the expiry date falls on a holiday, the contract expires on the preceding day. Commodity derivatives are available for different periods depending on the commodity, with futures ranging from monthly to yearly and options being of similar duration to the associated futures contract. Lot size refers to the quantity of a commodity covered by the contract, with sizes varying between commodities like gold futures covering 1 kg versus gold mini covering 100 grams.