18-19 years old, get CPL and instructs for 600 hours
19-20 800 hrs. RHS ATR 72
20-21 800 hrs. LHS ATR 72
21-22 800 hrs. LHS 737
22-23 800 hrs. RHS 737
23-24 800 hrs. RHS 747
24-25 800 hrs. LHS 747
Thats about 5000 hours before getting into the LHS 747.
Can be done.