What is the minimum data size needed to train a model that understands human languages??
The minimum data size needed to train a model that understands human languages depends on many factors, such as the complexity of the language, the size and complexity of the model architecture, the specific task the model is being trained for, and the quality of the data being used.

In general, natural language processing models require large amounts of data to be effective. For example, large pre-trained language models such as GPT-3 by OpenAI were trained on up to hundreds of billions of words of text. However, smaller models can be effective for simpler tasks or for specific domains.

It's worth noting that the quality of the data is also important, as the model will learn from the patterns and structure present in the data. Low-quality or biased data can lead to poor model performance or perpetuate harmful biases. Therefore, in addition to the size of the data, the quality and diversity of the data is also an important consideration.
That is a proper reply, however if you had to estimate the lowest data size in Gigabytes or Terabytes, please do so.
It's difficult to give an exact estimate of the minimum data size needed to train a model that understands human languages in terms of gigabytes or terabytes, as it depends on various factors as mentioned earlier. However, to provide a rough estimate, some smaller language models have been trained on datasets ranging from a few hundred megabytes to a few gigabytes of text data. For more complex tasks and larger models, the data size requirement can be much higher, ranging from tens to hundreds of gigabytes or even terabytes. Ultimately, the size and quality of the data should be chosen based on the specific needs and requirements of the model being trained.