Roundup Weed & Grass Killer Super Concentrate, 35.2 oz

Round up 50% kills all weeds. It took 2-3 days before I noticed anything, but then it was dead

I have a pretty long driveway but unfortunately its also just gravel which allows grass and weeds to rampant throughout it. Bought this hoping it would do what it says it would. Mixing is about 2 oz mark on cap per gallon but i wanted something a little more stronger do i went 3.5 oz per gallon . Anyways after spending 2 hours spraying my driveway and feeling pretty hopeful it was just wait and see. Day one noticed the weeds grass i hit lost its luster sign but for next few days i didnt really see much of anything dying then on 5th day I noticed brown setting in and day 7 everything i hit was dead. Im now sure why it takes longer to work but it does! I will update here again on how long weeds stay dead in near future