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That sounds like A LOT. I've done valve cover gasket jobs before (not on the LS400), but they dont take more than 2-3 hours, and the parts dont cost more than $100. In fact, most gaskets are around $20 per side.
Perhaps one of the lexus tech here can chime in with quotes.
Yea, i feel like that is a lot to pay. And its not at a dealership, its a quote unquote "lexus car care place". I had plenty of work done at this place and i've been very happy with the service. but dang 750 seems a little steep to me.