Every day, your broker will close your position and re-open it at about the same price. This gives your position a new settlement 1 day into the future, or 3 days into the future if the roll-over is on a wednesday.You will either earn or pay to have that position rolled over every day, depending on the overnight interest rates involved in the currency pair you're trading.
This process can go on forever, and as long as you can handle the drawdowns, your broker won't have a problem closing and re-opening that trade because they are making money every time this happens. Right now interest rates are fairly close across the globe, so the cost/reward of "carrying" a position for many days is relatively low for most pairs thankx