Typically in UK interviews are ~2-3 months from DQ. Could be less. I was DQ'd 15th June, IL received 29th June, Interview is 8th August.
@jons_wifey Visa medicals have alot of availability at the moment, so you should find it easy to book once you are DQ. If you are missing any vaccines, it may be worthwhile already getting them on NHS if you can. I had MMR and tetanus booster done.