How often is the PA update for the Webpage?

[arpitibs]

I want to know how long it will take by MOZ to update the PA for certain webpage??

[Kelly-Anne]

Moz crawls and indexes billions of pages, adding fresh link data every day. This does not mean that PA will change every day. It will only change if they find new links to a respective site.

[GastonRiera]

Hey Arpitibs,

Moz's metrics are updated almost daily. 
If you dont see any change is because there were no changes on the backlinks that point to that page, or no new backlinks. Keep in mind that if any of your existing backlinks decrease/improve on its metrics, its possible that your metrics change too.

If you want more information about Page Authority, here the official Moz's resource:
Domain Authority | Moz resource center.

If you want to improve your metrics, here some insightful resources: 
- Search Engine Optimization (SEO) Starter Guide - Google Search Console Help
- The Beginner's Guide to SEO - Moz
- A Complete Guide to SEO: What You Need to Know in 2019 - Search Engine Journal
- A Simple 7‐Step SEO Tutorial for Beginners - Ahrefs

Hope it helps.
Best luck.
Gaston