I realize this is a nebulous question with no hard and fast answer. Just curious if there are any rules of thumb regarding playing times for a game/puzzle mobile app. Of course, value cannot be judged just by hours or minutes, but also by the quality of play and player skill... but let's leave that for another discussion.
Given a pick up and play freemium puzzle app (say each level takes an average of about a minute to play): What would be a reasonable and fair breakdown of free playing time vs. purchased playing time? My playing time estimates are based on a player with fairly good skills. The nature of the puzzles allow repeated additional re-playing to improve scores.
My current thinking is about 3 hours free play, with additional level packs priced at $1 for every additional 2 hours of play. I'd like my players to keep coming back for more, so I'd like to make sure the paid play is priced fairly (another nebulous term :).