I remember Sting CT used loads of the stuffDepends what you are killing. Perennial weeds need as long as possible and I would suggest over a week. Annual small weeds and if the label allows you could leave just hours. Back in the late 90’s/00’s Monsanto had a product Sting CT. It was a 120g/l glyphosate with a fairly aggressive wetter. Recommended rate was 4L/ha and you could cultivate within 4 hours if only targeting small weeds.