Day 1 - If a buyer is interested enough to make on Day 1, and potentially be competing against other highly motivated buyers, there is a good chance they will waive some or many or all contingencies.  They might not be proposing a home inspection, a radon test, or an appraisal contingency.

Day 7 - If a listing is still available on Day 7, a buyer will likely tentatively feel comfortable proposing some contingencies (home inspection, radon test, appraisal, etc.) but perhaps not all of the above.

Day 30 - If a listing is still available on Day 30, a buyer will likely feel comfortable proposing any and all contingencies, including a home inspection, radon test and an appraisal.

Home Buyers -- Do you want to wait to make an offer to potentially be in a position to include contingencies that you'd prefer to have as a part of your purchase contract?  Even knowing that waiting to make the offer might mean someone else buys the house before you make an offer?