After 3 weeks I have seedlings! The weather has been mainly cool and a little bit of rain. In the entire 3 weeks I only had to water once.
I've added mulch to conserve moisture now and hopefully keep the weeds down. There is good moisture deep down so with some heat and sunshine I should have some strong lettuce soon.
I've also did my second round of seeding so I'll see how long it takes when the weather is a bit warmer.