How much should a begginer be able to play?

Hi, i bought my first instrument ever, which is bass, around month ago. I didnt practice many days because of concert i went to, being sick etc so i will say i practiced around 17-20 days, about 40 minutes daily. I can play intros to seven nation army - the white stripes, brain stew - green day, come as you are - nirvana, feel good inc. - gorillaz (only small part, not full intro tho) and i am learning smells like teen spirit - nirvana since today. I made a very easy bass line for my band too. Is it good for a beginner?