That's much to short & why I never bought it.It looked good but I'll wait until it is at least half price for this half album.
Then he should wait for inspiration to hit again. It should, the artist needs a bit of patience. If he has reached the end of his musical productivity then chances are what he made already isn't going to be anything outstanding IMO. At that point he should release the 40 minutes worth of tracks on a mini album (at half the price of a FULL album), an EP or separately on various compilations. Under no circumstances should he charge full price for half an album or release an album with half fillers (or all fillers like some artists IMO).
This is of course all my opinion but it pisses me off when I pay full price for an album & it's over in about 30 minutes. Especially if the musics good as I am then desperate for more.
These are all around the hour mark which for me is not too bad. Of course I want that extra 20 minutes like there should be but an hour is just enough time to lose myself in the music.