People often ask how long they should use the same needle. Some retailers recommend that you change your sewing needles every time you start a new project or after 6-8 hours of sewing, but I personally find it hard to know when my projects are complete and which type/size is best for me.
In order to get the best stitch possible, I simply test a needle on my fabric and take it out of the machine. If there are any concerns with how well it is stabbing through materials or if its tip looks bent from use, then that’s when I think about changing needles.