Comps after the showing is a perfectly good workflow, and California's default offer-response window is three days, which you can shorten. Different agents handle comps differently. We personally do not run them before every showing, because we do not know upfront whether a buyer will actually want to write on a given house. Pulling comps after the showing, once there is genuine interest, is simply more efficient. Some agents prepare them in advance, and nothing is wrong with that either. On the expiration question: California's residential purchase agreement defaults to three days for the seller to respond, but that window can be shortened to whatever you decide to set. When you want a faster answer, writing a shorter response deadline into the offer is a common way to create urgency without touching your price.