Realistic times for summit climb

Hi,
I'm trying to determine realistically how long and hard the summit climb is likely to be? I know it can be weather dependent, but am just trying to gauge as best I can.
The Parks site suggests 8 hours return whereas other sites say between 5 to 5.5 hours. I also read somewhere that kids were doing the climb.
I'd appreciate any feedback anyone can provide as to how long it took and how hard people found it.
Ta
I'm trying to determine realistically how long and hard the summit climb is likely to be? I know it can be weather dependent, but am just trying to gauge as best I can.
The Parks site suggests 8 hours return whereas other sites say between 5 to 5.5 hours. I also read somewhere that kids were doing the climb.
I'd appreciate any feedback anyone can provide as to how long it took and how hard people found it.
Ta