Given the task definition and input, reply with output. This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.

Passage: With the unsuccessful and bloody Russo-Japanese War there was unrest in army reserve units. On 2 January 1905, Port Arthur was lost; in February 1905, the Russian army was defeated at Mukden, losing almost 80,000 men. On 27-28 May 1905, the Russian Baltic Fleet was defeated at Tsushima. Witte was dispatched to make peace, negotiating the Treaty of Portsmouth . In 1905, there were naval mutinies at Sevastopol , Vladivostok, and Kronstadt, peaking in June with the mutiny aboard the battleship Potemkin. The mutineers eventually surrendered the battleship to Romanian authorities on 8 July in exchange for asylum, then the Romanians returned her to Imperial Russian authorities on the following day. Some sources claim over 2,000 sailors died in the suppression. The mutinies were disorganised and quickly crushed. Despite these mutinies, the armed forces were largely apolitical and remained mostly loyal, if dissatisfied and were widely used by the government to control the 1905 unrest.
How many days did it take to defeat the Russian Baltic Fleet at Tsushima?