Ask HN: How much will practice improve your coding efficiency?

I'm a coder for 30 years now. Lately I went on a "startup spree". Starting new mini-web-startups as quick as I can. My last one took me one week to make. The current one, Im one week in and expect to invest another week. Im coding almost around the clock.

If I keep doing this and do - say 30 - startups in 2015 - will my coding speed go up? Will I create the same kind of project in 1 week that at the moment takes me 2 weeks?