They'll take about the same amount of time. The bacteria have to establish themselves in sequence and they can only reproduce so fast.
The absolute fastest way to cycle is to buy already-cured live rock-if well treated it's already cycled.
Check your man made rock supplier, some brands have been found to leach phosphates which can cause major algae issues down the road.
Many swear by bacterial additives to speed up the cycle. I'm not convinced these are a good idea.
hth
ivy