They Came on Viking Ships has 288 pages.
"They Came on Viking Ships" by Jackie French has 240 pages.
The Viking Symbol Mystery has 175 pages.
The Last Space Viking has 294 pages.
The Viking Way - Price book - has 435 pages.
The Time Ships has 454 pages.
Ships of Merior has 916 pages.
The Long Ships has 603 pages.
I believe it was 4,753
Then They Came for Me has 384 pages.
Unlike later ships of the Age of Sail, Viking longboats had many oars, as did the earlier ships of the Roman Empire. (see the drawing in the link below)
They Came to Baghdad has 256 pages.
Then We Came to the End has 400 pages.
The Rains Came has 597 pages.