A small website built with frames consisting of less than 20 html pages needs a few changes.
10 images need to be edited.
Font style needs to be changed.
The contact form on the contact page has to be removed.
The navigation needs one more link.
Maybe 4 or 5 more little changes.
All in all, I estimate that the time needed to do all changes will be less than 90 minutes at the most.
However, you should be aware of how frames sites are constructed and should have prior experience with websites built with frames.