Usually once sciatica has developed it has become chronic and takes time to bring under manageable control. Depending on the clinical findings, I normally will see a patient 3x a week for 2-4 weeks, 2x a week for 2-4 weeks then 1x a week for 2-4 weeks. It may seem like a broad spectrum, but a lot depends on the longevity of the condition, complicating factors such as age, physical condition, disc involvement, or spinal curvature and how quickly the patient responds to treatment. Once I have the patient's condition under control, I advise a wellness program of one visit every 4-6 weeks, symptoms or not. It is easier to control a condition and more economical this way other than let it recur over time and have to start again.
One word of advice: If you are male, don't sit on your wallet, and if female, don't wear heels more than for extended periods. Both of these help to create sciatica because they cause structural imbalance.