Waits (sleeps) for a given period of time before resuming the flow.

  sequence do
    accounting :task => 'invoice'
    wait '30d' # 30 days
    accounting :task => 'check if customer paid'
  end

‘_sleep’ is also OK

  _sleep '7d10h' # 7 days and 10 hours

(the underscore prevents collision with Ruby‘s sleep method)

:for and :until

TODO