There are many variables, but if you make some assumptions about a 15 year captain...

1) Decent line w/ no reserve
2) Enough days off to pick up volunteer flying
3) The option to minimize long layovers, or just do daytrips...
4) The option to make extra money as a check airman.

$70-$100K is a reasonable pay range, let's call it 85K. If you do one 3.5 day trip per week (minus three weeks vacation), you get paid: $20/ hour away from home.

If you are on duty an average of 12 hours each day, you get paid: $40/ hour of duty.

If you use your travel benefits a lot, you might want to factor that in...aside from commuting we use over $20K/year of travel, which is alot.

Now the good news about time away from home is that it's not all bad...I work out more on trips, and when you're actually asleep, it doesn't really matter where you are.