It's simple. A Future contract is basically when buy/sell a currency (or something else) at a predetermined price on a selected date in the future.
- Quarterly Futures contract => expires after a 3 months period (4 quarters per year, 1 quarter=3months)
- Perpetual Futures => it does not have an expiry date unlike traditional forms of futures contracts. It can be perpetual
This answers your question in all.
but to add on futures trading, you must taken consideration the leverage. If you try to do a quarterly futures contract, then you should be having less than 25x I suppose, even a 5x will do for that very long time but this does not guarantee you that it won't be liquidated it is still depends on how the market will move. Now I'm looking into quarterly futures trading, is it too risky than having short with high leverage?