How long should i use windscreen wipers for before changing them?

what are the signs to look for to indicate that they should be changed?How long should i use windscreen wipers for before changing them?
i own a repair shop ,and its s good idea to change them every 6 months if possible,, i try and do it,,but I'm always late,,but this is a good time to do it,,another good way to do it is when you have your oil changed ,that's the one thing we always forget until it rains,,then you remember to change them,,but id try to change them at least twice a year,,at the least,,good luck,i hope this help,s.,have a good and safe x-mas.How long should i use windscreen wipers for before changing them?
about 1 yearHow long should i use windscreen wipers for before changing them?
when the rubber starts to come off or crack or you notice that they are not doing a great job, missing spots and suchHow long should i use windscreen wipers for before changing them?
Different brands will last different amounts of time. Just replace them when they are no longer working well.How long should i use windscreen wipers for before changing them?
When they're not cleaing the glass well and when you notice that it's harder to see and water is streaking it's best to change them since they're fairly cheap to replace.How long should i use windscreen wipers for before changing them?
Once a year is the rule of thumb...

BUT THE BEST WAY TO KNOW IS TAKE THE WIPER IN HAND RUN YOUR THUMB AND FOREFINGER DOWN THE BLADE IF FEELS RUBBERY YOUR GOOD IF YOU GET BLACK LITTLE GRITS IT FEELS DRY AND HARD TIME TO REPLACE.How long should i use windscreen wipers for before changing them?
If you find yourself looking out the open side window to see where you are going, then yes, I would get new wipers.

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If it's not raining when you do this, maybe a bucket of soapy water and a sponge is necessary.

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A snow shovel in the trunk to scrape gunk off your windshield is a good indicator you need new wipers. Or, you could stop using your truck to hunt deer with.

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Using the windshield wash reservoir to store your emergency beer in, is not a good idea. The reservoir is for Jack Daniels only. Beer should not be stored where it can get warm.