This task involves annotating the answer type to a given question that involve some kind of complex reasoning (including numerical reasoning). Note that the questions require looking at more than one part of the passage to answer. There are 3 possible answer types (i) spans, (ii) numbers and (iii) dates. If the answer can be found in the passage, label it as "span". If the answer is a number, label as "number". Similarly, label "date" if you think the answer to the given question is a date.

Passage: He represented the Liberal party at the Norwegian Parliament (Storting) 1886-1888 and again in 1892-1898. He was Minister of Labour (18981899, 19001902, 19021903), a member of the Council of State Division in Stockholm (18991900), Minister of Foreign Affairs (1905 and 19051907), Prime Minister and Minister of Foreign Affairs (19071908), and Minister of Education and Church Affairs (19151920). In 1905 became the prime minister in Stockholm. He was chair of the Norwegian government of Christian Michelsen. In October 1907, Lvland took over as Norwegian Prime Minister when Michelsen resigned. Lvland resigned the position in March 1908.
Question: How many titles did he hold that lasted for more than a couple of years?
number