Well, considering the fact that the recycle bin of a computer receives all deleted content and accumulates it over time, its advisable to empty the recycle bin at least once every month in order to free space on the hard drive of the computer.

This is owing to the fact that the recycle bin is just like any folder on the computer, it's size gets bigger with the more files deleted and this means that it consumes a party of your hard drive as well if not emptied on time, you might not have space on your computer to save files and before you say jack, your computer would start lagging which is an indication that there is shortage of storage space. That is more reason why it is essential you empty your recycle bin once every month, same way you do your waste bin.