  We study strange non-chaotic attractors in a class of quasiperiodically
forced monotone interval maps known as pinched skew products. We prove that the
probability of positive time-N Lyapunov exponents, with respect to the unique
physical measure on the attractor, decays exponentially as N goes to infinity.
The motivation for this work comes from the study of finite-time Lyapunov
exponents as possible early-warning signals of critical transitions in the
context of forced dynamics.
