In this paper we consider the mean length of transients and the length of s
tate cycles in random Boolean networks. We present an approximate calculati
on of these quantities as a function of the size and connectivity of the ne
twork. where using an annealed approximation we derive a recursive formula
for the length of steps of the system. Using the mean step length and an ef
fective momentary' state space, we calculate an approximate formula for the
probability distribution function (PDF) of the length of state cycles and
transients. We compare this PDF with analytical results in special cases an
d with simulations by the Monte Carlo procedure.