I'm not sure i agree that a series of half days would be more effective for bonding. Essentially what you are doing is teaching your adoptive child that you and DH are now their primary carers, and the only way to do that - especially with a young child - is to actually be there and do the caring stuff (feeding, nappies etc). The message that "daddy goes and daddy comes back" is for a bit later down the track.
Introductions very quickly went from a couple of hours to full days for us. Plus factor in travelling time, plus the fact that it is soooo emotionally tiring, I think you would be doing work, your child and yourselves a disservice to try to combine work and introductions. How much time you need off to get the practical arrangements in place ahead of introductions will depend hugely on circumstances (eg the age of the child, what you already have, what you need to buy).
To give you an idea, our timetable was something like:
Thursday - panel
Friday - last day at work
Sat-Mon - put together cot, buy buggy etc
Tues - planning session with SW and FC then meet DD for 2 hours
Wed - four hours with DD, including DS coming
Thur - 10-4 with DD, including a trip out
Fri- 7-6
Sat-Sun - 7-7 with DD coming to our house for some of the time
Mon 6-8 with DD at our house the whole time
Tues - home with us
Add an hour's travelling on each end of those sessions and you can see how there literally isn't time for much else, including cooking and keeping on top of the laundry!
Plus, you will need to take into account your DD - our DS was brilliant during Intros, but he did need some time with each of us so that he didn't feel completely crowded out.