calculate_availability_budget.rb

require "dotiw"

include DOTIW::Methods

availability = 0.999 # three nines

#                         days per year
#                         |    hours per day
#                         |    |    minutes per hour
#                         |    |    |    seconds per minute
#                         |    |    |    |
seconds_per_year      = 365 * 24 * 60 * 60 # => 31536000
available_seconds     = seconds_per_year * availability # => 31504464
budget                = seconds_per_year - available_seconds # => 31536
budget_period_seconds = {
  'per day':     budget / 365, # => 86.4
  'per week':    budget / 52, # => 606.4615384615385
  'per month':   budget / 12, # => 2628
  'per quarter': budget / 4, # => 7884
  'per year':    budget # => 31536
}

budget_period_seconds.each do |period, seconds|
  puts [period, distance_of_time_in_words(0, seconds)].join("\t")
end