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You should get a sufficintly accurate indication after 10 seconds and, that way, you save a whole 50 seconds!
Distance equals speed multiplied by time. For example, speed is 72 km/h and time is 200 seconds or 200/3600=0,0(5) hours, so the distance traveled is 72*0,0(5)=4 kilometers.
Which ever you find easier. Find a fixed point ahead i.e. a telegraph pole. As the car in front passes it, in good driving conditions, say to yourself at normal speed, "Only a fool breaks the two second rule!" If you passed the pole before you finished it, you are too close to the vehicle in front. If you finished it way before you reached the pole, you are too far away from the vehicle in front. The two second rule mantra automatically adjusts the distance between vehicles dependent on speed. However, you must increase the distance by at least 50% for wet/slippy conditions. Repeating the first half of the phrase will do that.
10-15 feet . You need to be 2 full seconds behind. Pick stationary object vehicle in front passes, then count how long until you pass the same object. Not 2 seconds? Increase you following distance! Another rule of thumb is to stay behind one car length for every 10 miles per hour, so at 35 mph you would want to be 3 and 1/2 cars behind the car in front of you.