I think it’s more likely they start it when you have 10 points left so 190/200 or 150/160 or 230/240 depending on your age length.My assumption currently is the 10 turns countdown starts at 90%, so you are forced to deal with the worst of the crisis for 10 turns at max. The absolute maximum I could see is 95%.
(which means it would be 5 turns on online speed and 30 on marathon)