In total you need to expect about 15 hrs for the IR and another 15 hrs for the CPL SE.
Depends on your prior experience and currency. I quoted what the minimum requirements are in accordance with the rules.
I have seen plenty of people do it in those minima. The FAA specific manoeuvres are not difficult to master for a current commercial pilot and neither is the Instrument side. US charts are not rocket science and for those of us flying around Europe we have a pretty good exposure to constantly differing charts....
Of course if you have an interest in selling someone a 'conversion' course you will naturally have a differing opinion......