Temporal evolution of the non-thermal emissions (spectral index and integrated flux above 3 GeV) assuming a typical cluster with an age of 1 Myr and with a radius of the HII region of R_HII = 10 pc. The spectral index of the injection spectra is set to s = 2, electron maximum energy is fixed to E_e,max = 50 TeV, turbulence index is ν = 3/2, magnetic field strength is B = 10 μG, and electron-to-proton ratio is set to K_ep = 10^-2.