This might be true for building businesses, but I've started out trying to build a fun app in a day because I wasn't happy with anything on the App Store and it worked out quite well. It took more than a day, but it was a fun experiment and I got familiar with a few new libraries. I'm going to open source this and if people find it useful, then awesome!

Here's a post I did on it if anyone cares -

http://www.tejaswi-yerukalapudi.com/post/12487091818/one-day...