Good Day, I would love to bid accurately on your project, but need to understand exactly is broken in the drupal site and what the disred out come shall be. This is not only for me but also for other bidders. You will get more accurate and honest bids with a little more detail.
I have been programming Drupal since Drupal 5. I have listed some of my nicer projects in my profile.
30 hours is quite alot of time if your website is already standing and functional. It may not take that long. What I would do is, to get an acurrate assesment of the work needed to be done from you and then give you a fixed amount of time that I estimate to get it done. The deal is, if it takes longer, then it is my fault and there will be no extra charge.