We discuss the scaling of characteristic lengths in diffusion limited aggre
gation clusters in light of recent developments using conformal maps. We ar
e 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 common crossover behavior for the squares of the char
acteristic lengths and the penetration depth of the form N-2/D(alpha + beta
N-phi) With phi in the range -0.3 +/- 0.1 suggesting that there is a singl
e: dominant correction to scaling.