Nobody is that busy that they can't spare 30 seconds in a day to reply to a text, also nobody is that busy that they can't spare a single hour in a evening during the week.
If she says "I'm busy" it simply means she isn't interested in you. If you REALLY want to see someone, you simply make the time.
This is true. I have been dating a very busy woman for the last 4 months and she always makes time to see me, even if it's only for 3 or 4 hours that week.
And she really appreciates that I don't need constant attention like a lot of guys seem to. We text every day but sometimes several hours will go by between responses.
Some would say this shows lack of interest but her actions show high interest. We spend the night at each other's places, we both have our preferred drinks at the other's place(she has wine at my place and I have beer at hers), and she even got me a toothbrush for her place she keeps in the cabinet for when I am there. We also have shows that we only watch when we are together.
In some cases guys are their own worst enemy. If you want a successful woman with a good career and who actually has her act together then expecting texts within 30 minutes and her dropping everything for you isn't going to happen. This tells me that most posters don't usually associate with these type of women more than anything else.