AppStream2 MaxUserDurationInSeconds - What is maximum value?!?

What I can read form documentation [1] the property MaxUserDurationInSeconds on an AppStream 2 Fleet should accept values up to 432000, it clearly states Specify a value between 600 and 432000.

When deploying using Cloud Formation with this value, I get an error stating that Property validation failure: [Value for property {/MaxUserDurationInSeconds} is greater than maximum allowed value {360000}]. (This is not shown in the Dry Run, but a nice surprise at deploy time.)

Finally, when deploying with value 360000, the Console claims that this value is too large as well (see screenshot), and claims that 345600 (5760 minutes) is the largest acceptable value. This will stop me from temporarily adjust things like scaling via the Console, because it refuses to save with 360000 as MaxUserDurationInSeconds.

Is there an explanation for this? Can I some how set the larger value and have that stick?

[1] https://docs.aws.amazon.com/appstream2/latest/APIReference/API_CreateFleet.html#AppStream2-CreateFleet-request-MaxUserDurationInSeconds