May axion clusters be sources of fast radio bursts

Fast radio bursts can be caused by some phenomena related to 'new physics'. One of the most prominent candidates of the kind are axion miniclusters which can undergo conversion into photons in magnetospheres of neutron stars. In this short research note this scenario is investigated and important caveats are examined. First, tidal disruption of miniclusters can considerably extend the time span of conversion process, making it impossible to reach necessary $\mathcal{O}$(ms) level. Second, existing observations at two widely separated frequencies imply that axion-related scenarios can hardly explain entirety of FRBs.