How long would you wait after palliative short course radiation (i.e. 30Gy / 10 fractions) in metastatic NSCLC before initiation of chemo-immunotherapy?

I haven't typically waited for a specific period after short courses of palliative radiotherapy to start chemo-immunotherapy, if the patient has recovered from side effects from radiotherapy and is ready to start systemic therapy otherwise. Hopefully, data from studies and trials to better inform us...