What time to leave HRH for EE at VB?

Sorry for all the questions but we have only done VB once and never with early entry. If staying at HRH and VB early entry is 8am, what time should we actually leave HRH? my understanding, thanks to darknite and others is to walk from HRH to Citywalk and take bus to CB and from there walk to VB. I just need to know a good time to leave HRH for all this to happen especially because my teens will hate getting up any earlier than absolutely necessary LOL. TIA!

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