Is proxied GEO load balancer suitable for messaging app?

How long can proxied load balancer DNS queries be cached for?

I'd use polling so for example 1 person, using app for 1h for a month would do 108,000 requests.

Would that be about $0.10 or could that be reduced by caching dns?

Also since it would be polling, having 1000 users at same time would mean 1k queries per second to Cloudflare. At what scale that would be an issues for CF?

I'd be using Cloudflare for ddos protection.
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