What is typical doubling time of small cell lc. looking around i appears to be 30-220 days. this is a huge range, what is seen in real world? thanks.

Moot: How fast a particular cancer will grow varies with its particular genome at the time -- no two are exactly alike and none are stable -- and there's selection for the faster growing clones. Small-cell tumors untreated often reach massive size and kill within a few weeks of being noticed. Estimating doubling time isn't of much help in management decisions.