You will need more than a week. If you just want to predict the next word in a sentence, take a look at large language models. ChatGPT being one of them. BERT is a research alternative afaik. If you aim to learn the probabilities yourself, you will need at least a few months.

In general what you want is a generative model that can sample from the conditional probability distribution. In sequences usually transformers like BERT and chatgpt are state of the art. You can also take a look at normalizing flows and diffusion models to learn probability distributions. But this needs some maths, and i unfortunatly do not know what smaller models can be used for computational linguistic applications like this.