It's really quite simple for me: Sunday meal prep day. I do my groceries on Friday or Saturday, and dedicate a good 2-3 hours on Sunday as my main meal prep day since my weeks are usually fairly busy. In my grocery order, I get a 3 lb bag of carrots (baby carrots aren't my favorite), and 1 head of celery. As I'm cooking which ever meals I have planned for the week, between the breaks for simmering or baking, I peel half the carrots, chop them up and put them in a resealable container. Same thing goes for the celery in a different container. Fill the containers up with water to cover the veggies. Keep in the fridge until you need them! They stay nice and crunchy too. I end up eating a lot more veggies this way since they are accessible. I have some on hand if I am home, or simply bring some to work in a container with hummus or bean dip. Yum!
Prep time: 20 minutes at a maximum.
You can keep them in the fridge for about 4-5 days, any longer and some veggies get a bit slimy.