what is the limit for a prim size

[Dominic Pastorelli]

what is the size limit for a prim?

[Rolig Loon]

The maximum dimension in any direction is 64m.  See >>> http://wiki.secondlife.com/wiki/Limits

[Lindal Kidd]

The largest prim you can make with the Build tools is 64 meters in any dimension.  (That's up from just 10m, a nice improvement this past year!)

There are still some "megaprims" available.  These were outsized prims created during two brief periods when a change to the Second Life server code provided a "loophole".  These megaprims may be up to 256 m in size, in some cases.  You can edit them in most of the ways you can edit regular prims...rotate them, move them, retexture them, and change from one prim type to another (box to sphere to cylinder, etc.)  You can Path Cut, skew and twist them.  But the one thing you can NOT do with them is re-size them, in any dimension.  If you do, they snap back to the 10m maximum size and cannot be made larger again.

Look for free megaprim packages on the Marketplace, or use the free SALT HUD tool to locate and deliver megaprims.