server timeouts are hardcoded

server timeouts are hardcoded to 75 seconds in many places

e.g. in MultiplexingConnection we have _statesInFlight.Add(state, 75000)

if an operation is called with a larger timeout, it is not respected and the operation can fail due to timeout before it is expected.

e.g ExistsAsync with timeout 120s can timeout after only 75 seconds

the SDK logs this when it happens:

ClusterNode | Server 10.0.0.4:11210 returned OperationTimeout for op GetMeta with key

The operation should probably be retried in this case