I make this salad in under 30 minutes. My husband grills the squash and corn while I make the dressing and prep the other ingredients.
I love rotisserie chicken, and keep it on hand for lunches throughout the week, and then make stock with the carcass. I prefer the breast meat for this salad. You can grill chicken breast alongside the corn (it requires similar time) if you prefer.
If you are really in a hurry, you don't have to use grilled veggies (they do taste good!). Use your favorites.