  We introduce a novel concept of simple loop dwell time and use it to give
sufficient conditions for stability of a continuous-time linear switched system
where switching between subsystems is governed by an underlying graph. We
present a slow-fast switching mechanism to ensure stability of the system. We
also consider switched systems with both stable and unstable subsystems, and
obtain bounds on the dwell time in the stable subsystem and flee time from the
unstable subsystem that guarantee the stability of the system.
