It should depend (mostly) on the charger and battery size. Try to charge the S5 with the same charger you use for the iPhone and my guess is that they will tak

It should depend (mostly) on the charger and battery size. Try to charge the S5 with the same charger you use for the iPhone and my guess is that they will take more or less the same time. Never use third party chargers of dubious origin, apart from being not safe they tend to be slow.