Just my oppinion but i would not spray the plants for 2 weeks if the plant is in direct sunlight, it will burn the plant to death.
SpiderMites absolutly hate humidity. Thats why in my greenhouse i like to keep it nice and humid and thus so far ive had no spidermite attacks. If i were you mate i would just spray the plant with VERY MILD soapy water and carefully rub each leaf/infested area with a SOFT cloth. i would not think it would be a very good idea spray the plant for 2 weeks if the plant is in direct sunlight. Just make sure to use MILD soapy water, and rub it away until the pests have all died/slided off. Visit the plants the following day and if they have returned just repeat the process.