"Resistance of an electrical conductor is proportional to it length"
The intuitive explanation I found in many articles was that the greater the length of the conductor, such as a wire, the greater the number of collisions of the electrons with ions and therefore greater resistance. But how would this greater number of collision do anything to the drift velocity and therefore to the current $I$? Between any two collisions, the average speed of the electrons is the same and this affects the current? How would a greater length change this average speed between two collisions?