How long can you drive with coolant leaking into combustion chamber?

This problem is a big hassle, because combustion takes place when gas, air and spark mix and combust, this pushes the piston in a downward motion and thereby gives you acceleration (which causes the car to go forward). The first problem is that the coolant is water-based, and this will greatly reduce the combustion process, possibly extinguishing the combustion altogether... whereby causing you to run on 5 cylinders instead of 6. The second major concern is that water can cause the combustion chamber to rust. In the onset, the *leak*that is causing coolant to go into the combustion chamber is either a faulty headgasket, or a crack in the engine block from overheating. As the leak worsens (IT WILL NOT GET BETTER ON ITS OWN), the coolant will mix with the oil down in the oil pan, and then the water/coolant will get recirculated within the engine block and possibly cause rusting in the rest of the engine (sooner than later). 2 things that convolute your oil are dirt and water. Dirt is usually taken care of with every 3000 miles oil change, but water (if enough) can cause your engine to overheat, and then the engine block too crack worse or even sieze, and then a siezed engine could cost $1,500.00 to $3,000.00 to replace. A headgasket replacement is $500.00 to $800.00 (shop around for price). You might end up having to buy a different used vehicle if it is cheaper than a new engine block, depending upon your budget.