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Oktokolo3964dThat depends on how confident you want to be that the results aren't just statistical outliers. ;)
Also important: Have enough beta testers with each property combination contained in your target group.
Some basic properties are:
- Experience in the field your software is used in
- Sex, age, general tech affinity, main desktop OS, main phone OS, education
- Income (you may find surprising correlations for feature or UX design preferences)