Implementation will simple once we discuss exactly how you would like the two themes to appear. This will be particularly quick if you have an example of the styling you want.
Long delivery time keeps communication time in mind and that after the first version you may want to make a round of changes at no additional charge.
If you need continuing web mastering, search engine optimization, and other services then perhaps we can workout a future arrangement.
Thanks for your consideration and good luck with your start-up,
Joseph