Theoretically, a lot is possible in dreams, including having an LD that seems to last 9 hours or even longer every night i suppose. Practically, though, dreams will usually last much shorter and you won't be able to have a lucid dream every night.
Also, when you're saying 7-9 hours I assume you mean having a LD that lasts for your entire period of sleep. That is, however, impossible, seeing as you go through 5 different stages of sleep, and you only have dreams (either lucid or normal) in the 5th stage: REM-sleep.
Oh, and welcome to Dreamviews btw ^.^
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