How long does it take throat cancer to develop ? i've been having a clearing of the throat probl for about 7 years now . i was just concerned

Not that long: Development of cancer takes a long time but u r asking about progression. Head and neck cancers r usually fast growing tumors that untreated wouldn't allow 7yrs to pass. Without changes in voice, enlarging lymph nodes and other problems this is unlikely cancer. It could b a benign problem, so u should see your doctor and maybe an ent. Postnasal drip is a more common cause of your symptom.