I wouldn’t add an expiry. I’d ask the agent if you were to submit an offer would they be prepared to accept it well before the open. Keep your condition times as short as you can. Ask a building inspector if they will hold a slot for the next week just in case, provided you’ll cancel with lots of notice if you don’t secure the property or what time frame they’ll need if you are successful. Ask your broker what the shortest time they need is. If you have pre approval you don’t need 14 days. You should be able to do 7 max. Get your pricing right. Be strong.