Basically, don't try any of the TotSC missions until you've got an average party level of 6, otherwise you might find them frustratingly difficult. At level 6 you should find them amusingly challenging.
The Ice Island is a piece of cake, should take about an hour's worth of gameplay tops.
Balduran's ship is a little tougher. Some very intense battles as the mission progresses. But again, shouldn't take you all that long. Maybe 3-4 hours worth at most.
The hardest add-on mission by far is Durlag's Tower. Tough battles throughout and make sure your thief has a high detect traps ability as the whole place is littered with brutal traps. Also the final battle for the Durlag's Tower mission is incredibly tough (I found it harder than Sarevok as you can't simply concentrate your attacks on the main enemy for reasons which I won't go into) even with a high level party and may require some cheesy tactics to get through (ie: leave area, rest, go back for another whack etc). This quest will probably take around 6-7 hours to fully complete.
Bottom line is, they are all fun, they are all worth playing through. But I'd recommend you do it in the order of Ice Island then Balduran's ship and then Durlag's in order to sort've ween your way into them.
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