Lifetime on Main Sequence
L M3.5     T fuel / L = M/M3.5 = M-2.5
Example:  M=2 MSun      L = 11.3 LSun        T =1/5.7  TSun

  11 106
B0
 15
  13,000
440 106
A0
   3.5
         80
    3 109
F0
   1.7
           6.1
    8 109
G0
   1.1
           1.4
  17 109
K0
   0.8
           0.46
  56 109
M0
   0.5
           0.08