The waiting time before placing items on a newly painted desk can vary depending on several factors such as the type of paint used, the drying conditions, and the manufacturer's recommendations. However, as a general guideline, it's advisable to wait at least 24 to 48 hours before placing any objects on a freshly painted desk.
Keep in mind that the surface may feel dry to the touch within a few hours, but the paint may still be in the process of curing and hardening. Waiting for a day or two allows the paint to fully cure, reducing the risk of smudges, imprints, or damage to the painted surface.
If you're unsure about the specific drying and curing time for the type of paint you used, it's best to consult the paint manufacturer's instructions or contact their customer support for guidance. Following their recommendations will help ensure that the paint fully sets and provides a durable finish before you start using the desk normally.