The XXXHOLiC news just keep coming! xD
The backside of the obi-strip that came with volume 17 is announcing that XXXHOLiC #18 will be released in October.
I know the image looks blurry but I can assure to you that’s what it says xD
As we know, XXXHOLiC will be back in June, if we consider that volume 18 will have chapters from June to October, that gives us an average of 36 pages per chapter. But Kodansha might give a one month difference between the release of the tankoubon, in that case volume 18 would have chapters from June to September (assuming no breaks are taken in both cases), which gives us an average of 45 pages per chapter.
Either way, looks like the monthly chapters of XXXHOLiC will be as large as monthly chapters normally are, which is good!