Actually my son is doing this as a science project...which takes longest to boil(or reach 212 F)?Milk, Plain water or salt water...with controlled variables milk was the slowest to boil...his results were as follows ( each sat out at room temperature for 3 hours before experiment began.)
1 cup plain water- 1min 57.06 seconds
1 cup water with 2 Tbl salt- 1 min 52.23 seconds
1 cup full fat milk- 1 min 50.27 seconds
1 cup plain water- 1min 57.06 seconds
1 cup water with 2 Tbl salt- 1 min 52.23 seconds
1 cup full fat milk- 1 min 50.27 seconds