Goal and options: To get the paint on PVC pipe to harden.
output answer: Leave the PVC pipe alone to dry for a week.

Goal and options: How often should I water my plants in the outdoor garden?
output answer: Watering twice a week deeply will promote deep healthy root systems. Shallow watering daily will promote weak root systems and is not recommended.

Goal and options: In order to start a fire,
output answer:
use a collection of flammable debris and papers, add some lighter fluid, then touch with an open flame.