Boundaries became a buzzword somewhere around 2020, repeated until it lost meaning. Real boundaries are quieter, less dramatic, and harder than the Instagram quotes imply.
What a boundary actually is
A statement of what you will or won't do — not a request for someone else to change their behaviour. 'I'll be available 9-5 on weekdays' is a boundary. 'Don't message me on evenings' is a request. The first one is enforceable by you alone; the second depends on someone else's compliance.
Boundaries don't require the other person's agreement. They're not negotiations. They're descriptions of your behaviour going forward.
Examples in real situations
With parents on phone time
'I'll call you every Sunday evening — I can't do calls during the workweek.' Not: 'Mum, you have to stop calling so much.'
With work email
'I check email between 9 and 6. Replies outside those hours are exceptions.' Not: 'My boss needs to stop emailing me at night.'
With a partner who interrupts
'When I'm interrupted I'll stop talking until you finish.' Not: 'You need to stop interrupting me.'
With friends asking for emotional labour
'I have an hour for coffee this week, not the whole afternoon.' Not: 'You're draining me.'
Why boundaries fail
They were actually requests, dressed as boundaries. When the other person doesn't comply, you have no follow-through plan. Real boundaries include what you'll do if not respected: 'If I get a call after 9pm I'll let it go to voicemail and reply tomorrow.' The action is yours, not theirs.
Setting them once and expecting permanent compliance. Boundaries need restating, gently, over weeks. Most people aren't intentionally crossing them — they're operating from habit.
Boundaries are simple in concept and hard in practice. The hardest part isn't setting them — it's holding them when someone is upset about them.