We start the discussion considering the change in the intra-chain mobility as a function of the polymer chain length. To probe the effect we consider polymer #3 (4,4-dimethyl-4H-cyclopenta[2,1-b:3,4-b']dithiophene-cobenzo[c][1,2,5]thiadiazole; shown in the inset of Fig. and SI Fig. ) as the model polymer; the choice is made based on the calculated mobility values (𝜇~0.1 cm 2 /Vs) which remain close to the earlier predicted maximum mobility within hopping description (Ref. ) and it is expected that it will carry the signatures of both hopping-assisted mobility and high charge mobility. We find that the parameters of the electronic structure (energy gap and mean localization length of the contributory localized states) converge rapidly as the chain length is increased (as shown for the localization length in Fig. and for the energy gap in SI Fig. ). However, the distribution of mobilities evolves more slowly toward lower mobilities as the chain length is increased (Fig. ). This is expected for dispersive transport in 1-D systems where the probability of having transport-limiting deeper traps increases with longer chains; herein, mobility values decrease and converge to a stable distribution around 4000 monomer units (Fig. ). Yet, for a comparison with experimental mobility values, it is probably convenient to consider realistic polymer lengthsmaterial characterization of recently synthesized semiconducting polymers reveals that the average length of the polymer chains remains within 100 -500 monomer units. Consequently, for further analysis of transport properties, we consider polymer chains with 200 monomers and compute the average mobility values (〈𝜇〉).