It all depends on how high ttl is, the number of queries increase exponentially as you decrease it, with ttl=0 you have no caching. My company makes about 160q

It all depends on how high ttl is, the number of queries increase exponentially as you decrease it, with ttl=0 you have no caching. My company makes about 160qps which translates to about half billion per month, so it doesn't seem too unrealistic.