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Then, how long does it take for borax to kill ants?
24 - 48 hours
Also, does 20 Mule Team Borax kill ants?
For ants mix 20 mule-team borax and white sugar; same amount of each -- it kills them. If you mix the boric acid with equal parts of sugar it kills the ants more quickly. But if you mix one part to three parts sugar the ants will carry it back to their nests killing many of those too.
Mix a 50/50 solution of vinegar and water in a spray bottle. Spray it directly onto the ants to kill them, then wipe up the ants using a damp paper towel and discard them. You can also use vinegar and water as a deterrent; spray it around your windowsills, doorways and other places where you see ants coming inside.