In SoCal shop I'm visiting [still] a Bridgeport pattern, aka 'turret mill' is about 7' from 16" lathe. The column is offset of spindle bore, allowing X, Y, & knee to position support as Frank S did. Usually it's the V head of a pipe jack; RPM's are low, single-point threading a long pump shaft. Anything longer, uses added pipe jacks in their tripod stands.
For occasions of higher speeds, the table makes easy clamping of pillow block bearings. That spherical alignment feature is ideal.