10,000 hour rule only applies to professionals in a highly specific skill and field of study.45 minutes a day for one month - learn anything to a level of proficiency.
Make those 45 minutes effective:
1. Deconstruct your desired skill. Clearly define what you want to be able to do when finished. Discover what small incremental skills which make up the resulting skill.
2. Learn enough to self-correct
Get 3-5 resources/tools on subject (books, dvds, courses, etc) Do not finish, just gather enough information to self-edit.
3. Remove distractions (TV, internet...). Sit down, tell yourself "just 5 minutes" get sucked in and do the work for 45 minutes, then move on.
4. Practice at least 20 hours. Stick to it to overcome frustration phase to reach satisfying results.
Obviously, give more time to the main priority and then allow time each day for supportive studies or creative expression.
My primary life skill that I want to take to a level of mastery is drawing and painting portraits and the human figure to create large allegorical oil paintings. Breaking this down entirely would take too much time, so one aspect of that is anatomy:
Goal: understand anatomical influences behind the physical appearance of the human figure.
Main elements: skeleton, muscles, veins, and accompanying terminology
45 minutes a day:
Day 1 - copy entire skeleton and learn names of major sections (skull, trunk, pelvic girdle..).
Day 2 - copy section one and learn terminology for smaller parts (frontal, maxillary, mandible...)
So on and so forth. Teach what you learned to someone else to receive 90% benefit/retention of what you're learning. Make and keep it fun!
Life's a grind...but we need that to make flour, to make bread, and bread is good.