Answer
If the documents are prepared in advance, opening a bank account in Uruguay can take 2–3 days. The procedure requires you to be physically present in the country for that period, so it is risky to allow only one day when making last-minute plans.
The timeline depends on how complete the document package is and on the requirements of the particular bank. The clearer the source of funds, income, personal details, and purpose of the account, the less likely delays due to additional questions are.
When planning a trip, it is better to allow extra time: do not book a flight immediately after visiting the bank, and gather all potentially necessary documents in advance. Then 2–3 days is a realistic guideline rather than a guarantee in every situation or with incomplete documents.