Process in making a production

I have never realized the process it takes to make a film production ranging from a commercial to a feature film. I watched a documentary on making a 30 second commercial and it took almost 3 days to shoot, just for around 6 or 7 shots. I am also in class this semester where you have to make your own 15 minute feature film by yourself. At first I thought no problem but this an extremely hard task to succeed at alone. I give tons of credit to all those underground producers and directors with hardly any money trying to succeed making a 90 minute movie. I now realize how hard it is to make anything today on Tv or in theaters but hey that is why people love making and watching them.