-It is possible to vastly compress most learning. In a surprising number of cases, it is possible to do something in 1-10 months that is assumed to take 1-10 years. -The more you compress things, the more physical limiters become a bottleneck. All learning is physically limited. The brain is dependent on finite quantities of neurotransmitters, memories require REM and non-REM (NREM) sleep for consolidation, etc. The learning graph is not unlike the stress-recovery-hyperadaptation curves of weight training. -The more extreme your ambition, just as in sports, the more you need performance enhancement via unusual schedules, diet, drugs, etc. -Most important: due to the bipolar nature of the learning process, you can forecast setbacks. If you don't, you increase the likelihood of losing morale and quitting before the inflection point.