add new " IntoSystemConfig/SystemConfig"

[wild-fruits]

.add_system(schedule,my_system.run_for(Duration))
.add_system(schedule,my_system.run_every(Duration))
🤔🙂

[Fidius-jko]

We can make this:
.add_system(system.run_if(every(Duration))
.add_system(system.run_if(for(Duration))