The charging time depends on the intensity delivered by the charger.
The regular PSP charger delivers 2A, so charging from it will be faster than using the USB cable.
(An USB 2 port will deliver a maximun of 0,5A. )
It's impossible to charge the PSP with the regular USB cable and an USB adapter ; but if it works with the combined cable, the charging time will depends on the intensity delivered by the USB adapter.
USB adapter usually deliver 0,5A like regular USB port but some adapters can delivers more (or less).
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