Overtime ( 残業 ざんぎょう , Zangyo) or "outside regular labour" ( 所定外労働, しょていがいろうど - Shoteigai-rodo) is a common issue in startups, IT, tech but also in Japan in general. Legally Japan has a 40 hour work week! (legal text) Contracts with employee's that exceed this regular working duration are illegal. That being said, In order to be able to work longer, there is usually a section about overtime handing. e.g.:
1 所定外 a法定超 15% 2休日 a法定 40% b法定外 40% 3深夜 20%
(Note: the numbers are fictional)
Dissected that means: There is overtime regulation used at this business. Four different rates apply:
法定超 - regular overtime (within the regular boundaries)
休日 - overtime on holidays
法定外 - exceeding overtime (outside of the regular boundaries)
深夜 - late night (overtime occurring in late-night)
For each of those entries the assumption is that the overtime is addtionally to the 100% hourly vage. e.g. 15% means 115% of the hourly vage.
As overtime comes with a cost, it requires usually consensus of management to take overtime. In order to reduce bureaucracy companies might grant a unregulated monthly prepaid overtime to contracts:
月 30 時間相当の時間外割増賃金として支給する。
Which means that the salary includes up to 30h/month overtime. Or in other words: up 30h/month you don't need permission from your manager to take the overtime but also you will get paid the 30h/month no matter if you actually work them.
Many companies struggle with making their companies leave early.
Playing "end-of-day" song
Switching off the lights (need to switch on manually)