This may depend on the type of treatment you have and how soon in the recovery process you have to return to work. Most tendon ruptures take a minimum of six weeks to heal enough for the kind of walking and standing your job requires. If surgery is needed, then the process can take longer.
Studies in animals and humans have shown us that early tension and load through the Achilles tendon can actually help the healing process. Weight-bearing seems to stimulate increased blood flow to the area. Putting weight on the leg also improves muscle strength as healing takes place.
Safety is an important consideration. In your case, both your own personal safety and your patients’ safety are factors. You must be far enough along in the rehab and recovery process to be able to function safely in the extended care facility where you are working.
It’s likely your employer has some basic criteria to guide your return. Following these guidelines will help ensure both your own safety and the safety of the clients under your care.