[kez]

how long normally does the side effects of wind and spotting last?

[robo]

This info from the PDR may help
http://www.drugs.com/xenical.html

Wind and spotting are (unfortunately) common side effects of Xenical treatment.

These and other commonly observed adverse reactions were generally mild and transient, and they decreased during the second year of treatment. In general, the first occurrence of these events was within 3 months of starting therapy. Overall, approximately 50% of all episodes of GI adverse events associated with orlistat treatment lasted for less than 1 week, and a majority lasted for no more than 4 weeks. However, GI adverse events may occur in some individuals over a period of 6 months or longer.