You could approach the Personal Magnetism tape a couple of ways. The evening before you have an important meeting or interview listen the to the tape then.
You could listen to it for 3 days and see what happens then give it another couple of days and see again. You could also listen to it for a week and then leave it for a week to see your results and then use it again as you feel necessary.
The beauty of the paraliminals you can use them how your intuition tells you. If you are about to listen to the tape and sense a strong no go with that. One listening can be all that is required and additional listening may just be using your time that you can better spend on something else. I find it best to be flexible. After a week I find it best to take a break from any particular paraliminal.
Alex