What is the Battery Charging time with included Fast Charger for Z3+?

Hi, I bought Z3+ two days ago. Fast Charger is taking around 2 hours 15 mins to full charge the phone in switch on mode. Is it the actual time to charge it with Fast Charger?

If I connected it to PC USB Cable, the charging time is very slow. Is there is any tips improve it?

Thanks in advance

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