Sexy Challenges doesn't want you to get caught up in the amount of time you spend having sex. You need to focus on the quality and not the amount of time it takes. Some people can have amazing orgasms with each other in a matter of minutes while some couples can have marathon sex. If you lucky you can enjoy both. You need to get out of the mind set that sex has to last a certain amount of time. If you are both satisfied with the sexual experience then the time gets thrown out the door.
Now if you want to have more time for sex then this book can help:
Find 10 hours of guilt-free time in your week – without using “traditional time management“. Walk step-by-step through this program to uncover your unique approach to management time. Each section of this 80-page guide contains holistic time principles, exercises, and templates that will leave you with more time to spend with your family, on yourself, and enjoying life.