Exploiting spin coherence phenomena in quantum materials is both technologically and fundamentally relevant, particularly in view of recent developments in quantum computing. Attempts to combine the advantages of inorganic and molecular materials have led to promising materials for use as quantum bits (qubits). These materials include isotopically engineered nitrogen-vacancy (N-V) centre nanodiamonds5 and N@C60, graphene, and metallic molecular magnets. We recently demonstrated that a long itinerant electron spin lifetime in a magnetically homogeneous conducting carbon nanospheres can be achieved at room temperature.With the help of this muon experiment we will understand the origin of the unprecedentedly long spin lifetime of the metallic-like carbon nanospheres.