Those that still photograph film will attest the need to really consider every photograph, and with 24 frames to play with that’s not much. The number of photographs you allow yourself is a personal choice, to make it meaningful keep to a smaller number. Using 24 is a nice number as it harks back to the days of film, and those holidays when you’d take two or three roles with you.
To really emulate the feeling of shooting film with a digital camera try only allowing 24 photographs for one week, and no deleting! Now every time you hit the shutter you really need to know you’re photographing the best possible angle, learning to do this will improve your work.