Hi there!
Well the thing is, that treatment schedules and treatment times are designed after through research and are usually the minimum required for adequate treatment. I would suggest consulting you doctor for alternative brands for the same drug (capecitabine), that might be cheaper or considering alternative thereputic measures that you may be able to afford. It might also be a good idea to contact the social services in your region, if they would be in a position to help.
Hope this is helpful.
Take care!