Every electronic dance music (EDM) genre started once with the first song (track) in that genre, which is also the case for deep house. By knowing what the first deep house song ever is, we can learn more about that genre.
Mixing techno songs (tracks) as a DJ can be hard, especially with beat synchronizing off. With practicing, we can become better at mixing techno songs. Moreover, we can become better techno DJs faster by practicing the mixing with the right songs.
How long it takes to produce an EDM (electronic dance music) song depends on the experience and knowledge of the producer. Also, the choices he/she makes influence how long it takes to produce a full EDM song.