Be flexible and plan ahead to secure your desired exam slot. Pick a time where your home or office environment poses minimal possibilities of disruptions and distractions (family needs, Wi-Fi usage, etc.).
Weekends tend to be a popular choice for testing and can also result in a longer waiting period before a Pearson VUE greeter can start the online check-in process.
For more information on The Open Group online exams see https://www.opengroup.org/certifications/online-proctored-exams