That would not be hard unless you are disabled.
You can walk to higher ground on any island within 30 minutes or less and you’d have a lot longer warning than that ... at least a few hours.
If you stayed in your car and got caught in the traffic you would not make it.
Thanks,
Dad (R.I.P.) was in Hawaii a few years ago & there was a warning to evacuate in Honolulu area one April Saturday evening.