College credits are not based on the amount of time it takes, it is based on the credits you earn. Failing courses and getting low grade marks reflect poorly on you, jobs are competitive you will get overlooked with such markings. If you're going to go to college make it with your time and money, mediocrity only hurts yourself.
It will only count that you have been in college if you have good grades. This is because the poor grades will not enable you to achieve your career goals since employers consider the grades more that the level of education. You need to put more efforts in improving your grades if you are interested.