How long does it take to deflate a tube for a 26" bike tire? Simply by removing the valve, how long does it take to deflate a tube for a 26&quot; bike tire?  Also, is there a safe and quicker alternative to do it?  Thank you.
I wouldn't bother removing the valve core - assuming its a schrader/AV/car valve, press something pointy into it for ~20 seconds and most of the air will come out.
If you want to roll the tube up, it is convenient to have a deflater tool, essentially a valve cap with a pin that presses the valve's stem and lets the air out.   Convenient but not necessary.
If you have a presta valve then pressing the stem with your finger works fine too.