8 days from Barclay Bay to Mattice would really be pushing it. The winds on Missinaibi Lake can be punishing - it's what, 20 or 30 km long and in the direction of the prevailing winds. She is a harsh mistress, and you may be shorebound just at Barclay Bay for a day or two if the winds are too high. I'm not saying that it can't be done, but a great deal of skill, excellent gear, and no small amount of luck would be involved.
I paddled the upper Missinaibi a couple of times about 20 years ago (and I'm hoping to do it again in a year or two). From Barclay Bay to Peterbell was about 3 days at our admittedly safe pace if memory serves. You won't have much trouble with winds on the river unless the weather gets really nasty, as the river is narrow enough until past highway 11. Peterbell to Mattice in 7 or 8 days is definitely doable, but it doesn't leave much time aside for inclement weather keeping you shorebound for a day or two.
I should add I did it with one partner, double carrying, and we were relatively novice whitewater paddlers at the time, so your pace might be quicker if you're able to portage less. You'd likely miss the sojourn into Brunswick Lake though, especially starting from Barclay Bay, and I do highly recommend that detour (tough portage though, that).
I highly suggest getting a copy of Hap Wilson's Journey To The Northern Sky - it was invaluable to us, both as a planning aid and as a guide. I would also suggest changing the title of this post to be more specific, so it may be archived better?
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