I believe you misread, Yanari. This spell is the 52nd level spell. Primal Remedy is the 44th level spell.
And, while a 90 minute BO3 is nice, I'm not sure that it's worth the hassle to get it. I'll just stick with casting BO4 every 15 minutes.
Edited, Wed Apr 2 11:07:57 2003
Well if you have had it drop so many times how about letting the rest of us in on what drops it. Some of us bards would like to get one for ourselves ...