An few negative posts on how many hours it will take, there IS some truth in this, but if you go about it in the right way it is quite doable for most people in the 45 hours, what you need to do is plan it right, start about this time of year and do the first 10 hours or so getting in at least two or three trips a week, more if possible, then book a couple of weeks holiday where you will then fly MOST of your hours, and again, try and do at least two trips a week following this - to get two/ three trips a week you will probably need to book three trips a day on both your days off (assuming a normal work pattern) and accept you will lose about a third of these due to weather. If you can do more than this then even better. Also look at flying evenings if you can find a school that opens later - sometimes the best time to fly, but be careful of being tired if you have worked a full day.
Doing this you CAN budget on 45 hours, as pointed out, you then need to think about flying after your licence, and I would say look at shares in an LAA aircraft.