The American College of Sports Medicine has the latest recommendations that you should do 100 minutes of exercise a week for general CV health.
Now, your getting great results, =)
and your not mentioning any health problems or challenges so Ican assume your well and functioning well at all your daily living tasks. So really exercise comes down to two main points;
1) Do it when you can and for no longer tha n 45 minutes
2) Why 45 minutes ... personal choice so that you concentrate on intensity and not volume. Better to do 30 minutes harder than 60 minutes softer due to the EPOC. Which is basically just that you take longer to get over hard work. This means your metabolic rate is elevated longer and thus your using your bodies fuel at a higher rate for longer (often up to 12 hours later).
Keep up the good work and dont try to over-intellectualise it, your getting results and making it fun and thats what counts.
P.S. i couldn't be happier if you did 2 * 20 minute sesions day and kept intensity even higher and got the EPOC effect twice for the day and felt better time managed. Where is the down side i ask you? .... =) Let me know how it goes
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