Took just a few hours to do, quite enjoyable although I'm not sure I'd want to do a more complicated one, hard on your back and eyesight! Quite a nice puzzle, now I'm afraid to take it apart! In a way, it reminds me of a man on the beach in Vancouver, who built rock formation with incredible forms and unbelievable balance, one on top of another! It lasted only a few hours as the rule is to build it below the tide level, which totally destroyed his hours of work when the high tide rolled in.
MERCI Isabelle