I have some really coarse timing information for recovery from the Suspend state. With WFX4 Disabled and the laptop in the Suspend state for 5 minutes, hitting the Shift key brings up the logon prompt in about 1 second. With WFX4 Enabled and the laptop in the Suspend state for 5 minutes, hitting the Shift key brings up the logon prompt in about 6 seconds. Based upon these admittedly coarse measurements, a laptop that has been in the Suspend state for 8 hours would take about 8 minutes to eventually "catch up". Small wonder that users are power cycling their laptops!
To some what confirm this , yesterday I put it to sleep twice it came right back so with out worrying last night I close the lid ,this morning (hit any key to resume) at about 5mins I held the power button down till it shut off and rebooted it may have come back if I left it longer it had been asleep for about 7hrs.
To test this I just put it back to sleep and it woke back up imediately!