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I’m no expert but my :A young dog’s attention span is about 10 to 15 minutes. You’d do better if you spent 2 or 3, 10-minute sessions a day than a single multi hour session.
"Water Dog" by Richard Wolters is very outdated. Get yourself one of the newer complete training programs rather than just a book. I'd reccomend "Total Retriever Training" by Mike Lardy or "SmartWork" by Evan Graham. These two programs are a complete system with flow charts, updated training info, and they have DVD's available as well.Starting with a complete training program will save you a ton of time and money. The benefit is avoiding teaching bad habits and then having to spend time fixing things later on. Don't ask how I know this Cheers!SD