The length of time given could be rather brief, even so, which include 10 minutes (as is the case with JM Bullion). Dealers do this to try and defend by themselves from fast changing prices. The spot gold price is calculated employing facts from the front month futures contract https://eduardoyqhyq.blogchaat.com/34354454/gold-and-silver-bullion-prices-today-no-further-a-mystery