Minimum sample size to run Tobit regression.
You can have a look at this research
Censored Regression Analysis in Large Samples with Many Zero observations
https://www.google.com/url?sa=t&source=web&rct=j&url=https://repub.eur.nl/pub/1608/feweco19991109155424.pdf&ved=2ahUKEwjMpOih1JHfAhWszIUKHVtmAjIQFjADegQICBAB&usg=AOvVaw28aiigrrCiA8_tSJYhA5G7&cshid=1544321297107
As the minimum requirement is 30 any sample more than that will lead to accuracy of result.
30 observations
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