Test-case preemptive::test::does_not_predict_old_ports fails in AppVeyor

I added a bit of debug to get some context here:

diff --git a/crates/tor-circmgr/src/preemptive.rs b/crates/tor-circmgr/src/preemptive.rs
index b7c9c5ef..e16d36e9 100644
--- a/crates/tor-circmgr/src/preemptive.rs
+++ b/crates/tor-circmgr/src/preemptive.rs
@@ -167,7 +167,9 @@ fn does_not_predict_old_ports() {
         cfg.set_initial_predicted_ports(vec![]);
         cfg.prediction_lifetime(Duration::from_secs(2));
         let mut predictor = PreemptiveCircuitPredictor::new(cfg.build().unwrap());
-        let more_than_an_hour_ago = Instant::now() - Duration::from_secs(60 * 60 + 1);
+        let now = Instant::now();
+        dbg!(&now);
+        let more_than_an_hour_ago = now - Duration::from_secs(60 * 60 + 1);

         predictor.note_usage(Some(TargetPort::ipv4(2345)), more_than_an_hour_ago);

The test fails with:

[crates\tor-circmgr\src\preemptive.rs:171] &now = Instant {
    t: 1148.8979544s,
}
thread 'preemptive::test::does_not_predict_old_ports' panicked at 'overflow when subtracting duration from instant', library\std\src\time.rs:424:33

It seems like the VM/container that AppVeyor spawns is started right before our build, so when we get to run our tests the call to Instant::now() yields 1148.8979544s which is less than 3601 seconds we use in more_than_an_hour_ago which leads to the overflow.