Time in Force
Time in force is a special instruction used when placing a trade to indicate how long an order will remain active before it is executed. These options are especially important for active traders as they can diversify their trading strategies.
Time in Force Types
There are three types of Time in Force orders which are used together with limit orders.
This order must be filled immediately and completely or not at all. No partial fills are allowed. FOK orders are normally used when several unlinked markets are available for the same asset, in which case the trader will try to get the whole order filled in each market sequentially, without having to manually cancel each order if it is unfilled.
If David places a buy long limit FOK order of 10,000 BTC/USDT contracts at 9,500 USDT while the market depth only contains 7,000 BTC/USDT contracts at the bid price of 9,500 USDT, the order will not fill any contracts and the entire order will be canceled it cannot be filled completely.