I've had mine for 3ish months, and I basically agree with everything the other person said.. I've had mine tightened about every 6 weeks but the time gets shortened after a while and it also depends on what they're doing to your teeth - some people need specific things not just straightening.
Also random tip- I would get silver or bright coloured bands if you have a choice, clear or white go yellow really easily! And don't eat curry if you can help it as it dyes your bands and that is not a great look aha.