@coder-902 , I'd been discussing on this internally and also awaiting for your reply. Current timeout value for functions proxied through Static Web Apps is 45 secs.
I have relayed the feedback to our product engineering and content author team, we will make this more clear in the Azure docs. Thanks for your feedback! Apologies for any inconvenience with this.
As an alternative, if feasible you could use durable functions in a 'bring your own' function app to kick off an orchestration for a long running workflow and poll for status (though the built in APIs for polling won't work in a static web app, you may need to create your own as per your requirement).
Thanks for your patience and cooperation!