  We discuss the scaling of characteristic lengths in diffusion limited
aggregation (DLA) clusters in light of recent developments using conformal
maps. We are led to the conjecture that the apparently anomalous scaling of
lengths is due to one slow crossover. This is supported by an analytical
argument for the scaling of the penetration depth of newly arrived random
walkers, and by numerical evidence on the Laurent coefficients which uniquely
determine each cluster. We find a single crossover exponent of -0.3 for all the
characteristic lengths in DLA. This gives a hint about the structure of the
renormalization group for this problem.
