It is the same interval for everyone. If you change your time settings, your arena payouts, store / energy refreshes and daily reset all time-shift by the same amount.
Each to their own, but I personally would need to have my arm twisted right up my back to change my fleet out for others on anything other than a very occasional basis
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Pretty sure it’s the same for everyone
I should probably strengthen fleet before going to bed, so I don't drop so far.