It takes a little more than three days for mathematical modeling from the question to the paper. In these three days, you need to complete the following work.

Examining questions (determining the main points and solving ideas of each question)

Topic selection (generally choose one of the two questions, and there are also comprehensive questions to choose from in the United States. Of course, it is better to choose to play by yourself)

make a model

Find a solution

Most of them need programs and running results.

Write a paper

If it is Mercedes, it needs some translation work.

Proofread papers

print

send by post

upload

So, time is tight.

If you are a novice in modeling, 3 days is basically not enough.

If you are a modeling expert, three days is easy to solve, but the optimization work after solving is not enough.

So many students worked for three days and nights in a row.

This is not recommended here. The first day and the second day will give the brain a better rest, and you may come up with better ideas when modeling and solving.

However, when writing a paper on the last day, it's all paperwork, and staying up late is ok.