How to utilize the single oauth token for multiple requests?

Summary:

Hi team!

I was trying to set up an external system with oauth 2.0 setup for rating.

In my opinion, the flow is OTM (creds)→ Ext Sys Oauth URL (token)→ OTM (rate req) → Ext Sys (rate resp) → OTM (have rates)

We wanted to understand if this generated token can be used for other rate calls as well. This setup is efficient for couple of rate requests, but while doing bulk planning and planning huge amount of orders will it be a good approach?

I went through the documentation, but there is nothing that talks about the lifespan or further utlilzation of the token