Pre-approval is the faster half, often a day or two once your income, down payment and identification documents are in the lender's hands. Full approval takes longer because the lender now underwrites the specific property, ordering an appraisal and confirming the file before conditions come off.
Self-employed income, a non-standard down payment source or a rural property outside city services can each add days to that window, so the condition period should reflect your file rather than a generic number.
Getting a fully underwritten pre-approval before you shop shortens the part of the timeline that happens after your offer is accepted. Get your hand-reviewed valuation from Joel Dyck.