Hi Steve,
Aibek is here from Growavelabs Agency: https://growavelabs.com/
Regarding your question about time, usually it takes from 1 or 2 days. To fully accomplish optimization of the store.
You have average points for the speed, which is not bad. But we can help you to obtain best results.
Our agency provides free optimization for the Shopify stores, if you’re interested feel free to join here: https://mailchi.mp/f33da12dcb76/optimize-my-website
And we can discuss further everything by email.
Best Regards,
Aibek