I was told to expect 1.5-2M exp for Core run and Insane gives +100% exp, so I would guess 3-4M. Also there is no exp cap in IWDEE, only level cap of 30. (with dual being bit buggy in that matter)
You're gonna get way more than that, easily 5 million+. That means depending on your party setup some of your characters should be able to reach max level in a single run.
When I played core rules with 6 characters I got 1 million per character in Icewind Dale (main campaign) 1 million per character in Heart of Winter (expansion) 0.5 million per character in Trials of the Luremaster (expansion)
Just finished the game on 'Insane' with a 4 member party and wanted to give you a little update. I would say 5.2-5.5 million XP per party member is a reasonable expectation with a full party of 6.
This factors in little bits and pieces you might miss
never bothered to figure out what to do with that golem book for example or if there's content related to the gemcutter
and is based on the assumption that you don't grind. That being said, there are places you can grind pretty efficiently.
I'm up to the end of IWD regular campaign with 4 member and they're at about 2.25mil each. No grinding at all. Looking forward to taking them through ToL because I've never done that! If they can reach around 6Mil after ToL and HoW then they'll be able to Breeze through HoF mode haha
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Also there is no exp cap in IWDEE, only level cap of 30. (with dual being bit buggy in that matter)
1 million per character in Icewind Dale (main campaign)
1 million per character in Heart of Winter (expansion)
0.5 million per character in Trials of the Luremaster (expansion)
This factors in little bits and pieces you might miss