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You can reapply as soon as you can rectify the reasons for being refused.
 
The first application was for 6 months, the government didn't believe that my partner would return to Thailand due to the length of time requested and her returning to work. Shortening the the time line to one month and maybe a stronger letter from her boss would correct this matter. Any thoughts?
 
Depending on what your partner would be doing during her stay (other than visit you) in Canada, even one month would consider to be long. Some posters had suggested 2 weeks for a sightseeing trip between Calgary and Banff.