What pulse produces a pulse of a specific duration?
A pulse generator generates a pulse. A pulse limiter reduces the duration of long pulses. A pulse extender increases the length of short pulses. A pulse multiplier produces multiple output pulses in response to a single input pulse.
How do I make my Redstone signal longer?
If you put a repeater down the redstone circuit will flow for another 15 blocks. This will slow the circuits signal down to the other end, but its useful in times. The number of ticks you add to the repeater, the slower the signal will go through the trail.