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