First time mom!!

Hi mommas!! I just had my beautiful girl 3 weeks ago and decided to take the breastfeeding journey. At first i would try to pump every 3 or 4 hours once i got back home from the hospital but ive been getting so busy with taking care of her while dad is back at work so most of the time im going long hours without pumping and noticed a difference with how much ive been pumping. I def do not want my milk to dry up but how long does it take for my milk to dry up? Or will my supply just stay low? HELP