Interesting chart comparing 60' times versus 1/4 mile e.t.
Although this chart is only a guide, it seems to be quite accurate.

 

60' Time 1/4 Mile ET
1.26-1.28 9.50-9.70
1.30-1.34 9.70-9.90
1.34-1.39 9.90-10.20
1.39-1.43 10.20-10.50
1.43-1.48 10.50-10.90
1.48-1.52 10.90-11.20
1.52-1.58 11.20-11.50 
1.58-1.65 11.50-11.90
1.65-1.68 11.90-12.30
1.68-1.73  12.30-12.60
1.73-1.79 12.60-13.00