I have 5 and 7yo boys who go to bed at 8/8.30pm all nights bar fridays and then they stay up intil 9pm.
I have had 'arguement's' with friends on times for bedtimes, but I am happy with my kiddies and they sleep well enough and are happy (most of of the time) and not tired so clearly they are getting enough!
They also both go to Beavers on a monday night, and that finishes and 7.45pm....meaning in reality that bedtime is 8.30ish (by the time they get home, get ready for bed, have supper etc....).
Now, my personal feeling is, if a church organisation can set a bedtime like that for 5-7yo children (rainbows are the same time on a different night) then it is clearly 'ok'...
I know that many out there are not religious or in any way favour things like the scouts/guide movement, and would therefore maybe argue with that, but I take it as an ok thing, and it suits US as a family.
what the mani thing tho that you need to realise......your child is the one you know, and the one you shuld be taking cue's from.....if he/she is tired and needs and earlier bedtime then so be it, equally if he/she can survive well on little sleep then go with that too.
asking others for a rough guide is fine, as you would not want your LO to feel 'out of it' amongst his/her peer's in the playground over bed times, but still....I say go with how you knwo you child is and then adapt bedtimes to suit.
have waffled a bit there, so sorry, but each child and each family is different so different needs suit IYGWIM