<s>[INST] how many days are there in a nillion years? [/INST] A "nillion" is not a standard or recognized numerical term, can you specify what you mean by this?</s>\ <s>[INST] I meant a million... [/INST] If all the years were only 365 days long, it would be 365,000,000 days.
If you include a leap year every four yeas, as you would in the Julian calendar, that adds 250,000 days, for a total of 365,250,000 days.
But, in the Gregorian calendar, there are 3 missing leap years every 400 years, so there will be 7,500 fewer leap days, for a total of 365,242,500 days.</s>