TTL incorrectly set when value in milliseconds is above ~24 days

The TTL on a document is being incorrectly set during an upsert if the value passed in milliseconds is greater than ~24 days.

Steps to replicate:

1.  Create a timespan object of 24 days (TimeSpan duration = new TimeSpan(24, 0, 0, 0))

2.  Upsert a document via the .NET SDK with an Expiry set to the millisecond equivalent of the above TimeSpan (document.Expiry = (uint)timeToLive.Value.TotalMilliseconds)

3. Check the TTL of the document, which is a valid unix timestamp (1503681410 in my case)

4. Run the same test with a timespan object of 25 days (TimeSpan duration = new TimeSpan(25, 0, 0, 0))

5. Upsert again

6. Check the TTL of the document, which is a unix timestamp WAY in the future (4292832329 in my case)