How does load balancing operate on >1 forwarders

[Jonathan Reed]

I have the forwarders statement to fwd queries to a few DNS servers on my
LAN.
forwarders { 10.0.0.1;
                       10.0.0.2;
                       10.0.0.3; }
The bind documentation says that these fwders are queried "in turn", but
what exactly does that mean? I understand it to mean that they are not round
robined and if the answer is found from the first IP then it stops there and
returns the query to the client. But assume that .1 goes unreachable. What
is the timeout used to query the next forwarder in the list? And is this
timeout modifiable?
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