Normally 16h00 unless you arranged for early check in
Depends on your status. If you're gold or platinum then pretty much wherever you want.
After 3pm
Between 2 & 3 pm, before that, give a call and inform the front desk about an early check in specifying your arrival time and they can let you know what is available with any extra or not.
You can check in as early as 3 pm at the earliest. But I'd suggest you call them prior for them to make this an option for you
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