The shelf life of disinfectants varies widely with some working solutions only being good for 24 hours, while others can be good for 6 months or more. If lab workers have questions about this, always refer them to the EHS SOP Chemical Disinfectants for Biohazardous Materials, which provides guidance about selecting an appropriate disinfectant as well as disinfectant shelf life, making diluted solutions, and disposal of expired disinfectants.
Bleach solutions will be most common in labs and 5-6000ppm is equivalent to a 10% solution made from bleach with 5-6% sodium hypochlorite. 8000ppm is a 10% solution made from 8% sodium hypochlorite. 10000ppm would be a 20% solution of 5-6% sodium hypochlorite.
Purchased 70% EtOH or IPA solutions likely will not have an expiration date and shouldn’t be cited for not having one.