Redshift evolution of the H₂ depletion time in simulations with HM, P19, and FG20 (solid, dashed and dot-dot-dot-dashed lines, respectively) UV backgrounds. H₂ depletion times within 1σ range (slanted shapes), 1, 2, and 3σ confidence levels (from darker to lighter shades), and maximum and minimum values (grey arrows) are derived from Ω_H2 observational data and limits in Table A.1 and Fig. 3. The Hubble time (thick grey dotted line) and the dynamical time, t_dyn (thin grey dotted line) are also shown. Results refer to both HI shielded (thick) and HI unshielded (thin) scenarios.