2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38438A review of the latest experimental results on charm particle lifetimes is presented. The most significant update is that the D_s^+ lifetime is conclusively larger than the D^0 lifetime and signifies that W-exchange/W-annihilation contributions are large. Using new high statistics data on $D^+\to K^+π^+π^-$ together with the D_s^+ lifetime and some assumptions, one can phenomenologically extract the strength of the W-exchange contribution in D^0 decays and of W-annihilation in D_s^+ decays. These are larger than or at the limit of theoretical expectations using QCD-based operator production expansion techniques.Talk presented at the 8th International Symposium on Heavy Flavour Physics, Southampton, U.K., 25--29 July 1999High Energy Physics - Experimenttext