tl;dr:rom Shopify’s engineering team, 25% of time is divided amongst 3 types of tech debt: (1) Daily Debt: engineers spend 10% - 4 hours a week - if they want to “tidy” or improve code in any area they encounter. (2) Weekly Debt: 10% - 4 hours a week - is spent on tech debt that can be solved by adding a card or issue to a sprint. (3) Monthly and Yearly debt: 5% - or two hour long meetings a week - is spent on future planning.