When we were there, the DLH/DTD side of security opened one hour before park open (so 7 for an 8 am opening). It actually started a bit earlier than the Harbor side. We were already in line at DCA before Harbor security opened.
When we were there the DTD security opened at 7am. I like it so much better than the Harbor entrance even thought it's about a 15 minute walk through Downtown Disney. We only use it when staying at DLH.
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