You may be wondering how many days are enough for Mexico City. In my opinion, you could spend way longer BUT five days in Mexico City is enough to explore the main neighbourhoods and take an iconic day trip that most travellers won't want to miss.
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I have been asked this question so many times. I personally wouldn't do less than 5 days in Oaxaca if you have the time. Of course, you can visit the city in fewer days, but it will feel rushed, and believe me you will leave thinking that you wish you would have extended your stay for a couple of nights.
The cheapest time of year to travel to Mexico City is during the off-season, with September being the cheapest month to travel. Late April and early May are the best months to visit Mexico City because tourism has dipped down a bit, and the weather is still quite nice.