this time is very crucial as a user who visits your website may lose interest to further interact with your website because it feels to slow for him/her.
To check page load speed time you can always head to following websites.
1. Google web page speed https://developers.google.com/speed/pagespeed/insights/
2. Gt metrix https://gtmetrix.com
if fully load time is in between 1-3 good else you need to minify JS, CSS and enable CDN(content delivery network)
and ya don’t forget to check latency