How to make a never stop loop in Synapse 3?

I tried lots of ways to make a never stop loop but all failed. The request is simple, press a key every 1 sec and continues for more than 1 week. 1. Add the macro group itself to the end of the macro. 2. Set playback option to "Toggle continuous playback on/off using assigned key" Both methods stopped after several minutes without any notification. 3. Insert loop section, but it limited to 99999 times. Is there any way to set up a never stop loop lasts for more the 1 week?