This app was mentioned in 4 comments, with an average of 2.00 upvotes
There's also an Android Wear watchface: https://play.google.com/store/apps/details?id=com.andreilicsandru.timeinwords
There's some free ones as well, but I don't have one installed at the moment and couldn't find one quickly.
I like Time in Words, works with ambient mode
https://play.google.com/store/apps/details?id=com.andreilicsandru.timeinwords
If you have an Android Wear watch-
https://play.google.com/store/apps/details?id=com.andreilicsandru.timeinwords
I love the time in words watch face https://play.google.com/store/apps/details?id=com.andreilicsandru.timeinwords&hl=en