Long-drawn

If you want to get a long-drawn benefit from this book, don't think once skimming the cream is enough for that.

Source: tatoeba (2946787)

Placed opposite, on a low seat, was her granddaughter, a huge book propped on her knee, from which she was reading aloud. Perhaps there was a charm in that sweet voice, which gave its own unconscious fascination to the long-drawn pages; but there was, also, the still stronger charm of habit.

Source: wiktionary