```ruby
require 'rest-client'
require 'nokogiri'
require 'json'

def get_movie_list
 json = (1..21).to_a.map do |page|
   puts page
   JSON.parse RestClient.get 'https://mubi.com/services/api/lists/108835/list_films', params: { page: page }
 end

 json.flatten.uniq
end

def get_runtime_for_movie(movie_id)
  doc = Nokogiri::HTML RestClient.get "https://mubi.com/films/#{id}"

  doc.css('.film-show__film-meta').text.strip.to_i
end

def calculate_total_runtime
  movie_list = get_movie_list

  runtimes = movie_list.each_with_index.map do |movie, i|
    puts i + 1
    get_runtime_for_movie movie['film_id']
  end

  require 'pry'; binding.pry
end

calculate_total_runtime
```

Add method for calculating total runtime
user
```ruby
require 'rest-client'
require 'nokogiri'
require 'json'

def get_movie_list
 json = (1..21).to_a.map do |page|
   puts page
   JSON.parse RestClient.get 'https://mubi.com/services/api/lists/108835/list_films', params: { page: page }
 end

 json.flatten.uniq
end

def get_runtime_for_movie(movie_id)
  doc = Nokogiri::HTML RestClient.get "https://mubi.com/films/#{movie_id}"

  doc.css('.film-show__film-meta').text.strip.to_i
end

def calculate_total_runtime
  movie_list = get_movie_list

  runtimes = movie_list.each_with_index.map do |movie, i|
    puts i + 1
    get_runtime_for_movie movie['film_id']
  end
end
```
assistant