Business trips are all trips that are not between your home and your usual work site(s), i.e. to :
- Visit a client
- Visit a service provider
- Travel from a company site to another one
This business trips can be local, regionl, national or international.
Estimate the distances from your travel habits, and add the big events where you went for work.
If you don't know the exact answer to a question, don't get bogged down and enter the order of magnitude that seems closest to reality.