Google My Business posts last for 7 days. It's all about posting what's happening now: property events, deals, promotions.
If you're posting to Google My Business, when someone searches for you on Google, your most recent post will show. We recommend you use a photo in the post- make sure you start with a good picture—something that grabs attention and pulls in prospects. From there, you will want to offer something that makes taking action now worthwhile, versus waiting and getting around to it sometime later. That means time-limited deals or coupon codes, exciting events, and similar rewards.
Select a quality attention-grabbing image, then write 100-300 word description. Note the ideal google posts image size is 750×750. 250×250 is the minimum size.
You can read more about GMB posts here: https://www.conductor.com/blog/2017/07/google-posts-for-business/
EXAMPLE OF WHAT IT WILL LOOK LIKE IN A GOOGLE SEARCH: