He spent 2*2=<<2*2=4>>4 years learning to climb
He spends 5*7=<<5*7=35>>35 months climbing all 7 mountains
After a 13 month break, he starts diving so that is 35+13=<<35+13=48>>48 months
That means it is 48/12=<<48/12=4>>4 years
So in total it all took 2+4+4+2=<<2+4+4+2=12>>12 years
#### 12