Take the "fastboat" Flaggruten to Stavanger (or by air), and the train from Stavanger to Arendal. Alternativ by air to Kristiansand and train from Kristiansand to Arendal
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rome2rio.com/s/Bergen/Arenda...
Here you can find several options
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Depends how you travel.The other answer was good,but with car you go to Odda,via Røldal and Haukeli,through Setesdal to Kristiandsand,and then to Arendal.7-8 hours driving
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