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As reported in #225, there is currently a bug in BatchTimer: if setting a timer too far in the future, the millisecond-delay exceeds int.MaxValue causing a crash.
The solution is to cap the delay at a safe value, here an arbitrarily chosen 1 day. This does not interfere with the precision of the timer firing because the ExpirationCheckLoop after the delay passes, the code always rechecks to see if the timer is actually ready to fire based on the current time. It does mean the expiration check loop runs at least once a day, which is o.k.