Simple Monostable 555 times
When you hit the switch the LED will turn on for secondes
Time is given by this simple equation :
T =1,1*R*C where T is in secondes, C is in farads and R in Ohms
In this exemple :
T = 1.1*(0.001*1000) = 1.1 seconde
This actually happens because the resistor slows down the charge and decharge of the capacitor so time would increase