It's not about the length of the trip. It's about the area one is touring in.
For me the cut off is a few days. Any longer and I can't carry enough laundry and have to factor stops for washing.
In the USA or Europe, this isn't an issue, but it could be in the 3rd world.
Then there's contingency planning. Where bike shops are all over, and logistics good, I can get by with minimal backup for problems I may encounter along the way. However, replacing a broken part may not be so easy in the Bush.
In the end, I'd probably pack lighter for a 2 month trip in some places than a one week trip in others.
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