Hello,
I can help you with this, it takes only 3 days, it's very simple system, especially for bitcoin.
The integration takes 3 days, but system is very very simple.
I have 10 years of experience with escrow thing, and i can help you do more than this, you can use the escrow for "bitcoin escrow" as standalone service, not just in your website.
If you want, please allow me to do this. I will help you promote this and we split the share from the second business (if you want)
Thanks.