Charles Messier was from France, and so the objects he discovered are located in the northern hemisphere. As such, observers must also be in the northern hemisphere—specifically within certain degrees latitude—in order to successfully observe all 110 objects in one evening. Otherwise, some objects will not be observable because they’re too close to the sun (and therefore too faint) or located below the horizon.
Whether you go for the full marathon or a shorter race, you must also consider your horizon, and how many trees, buildings or other items may obstruct your view of certain objects. Some of the observations are quite low to the horizon during their visible period. A dry-run at your chosen location will help you’ll encounter challenges during your scheduled plan.
Finally, determine how dark your location is. The Bortle scale measures the night sky’s brightness in a particular location using a 1-9 scale. Check interactive light pollution maps online, or use a smartphone app to check your sky quality.
Lastly, are there any bright lights in your immediate area that could unexpectedly pollute your sky? Check your location at night, not during the day, just to be sure.