Pebble flux ${\dot{\mathcal{M}}}_{\mathrm{p}}$ through the inner disc as a function of time for three values of St (St = 0.003, St = 0.01, St = 0.03) and three different initial protoplanetary disc sizes (R₁ = 112 AU, R₁ = 55 AU, R₁ = 203 AU) for the analytical pebble drift model of Gurrutxaga et al. (2024) with constant St_χ and α = 0.01. The thin black line indicates 1% of the gas flux for the 112 AU disc; the St = 0.003 case follows gas depletion closely due to the limited radial drift. Larger pebbles drain out of the disc by radial drift on a shorter timescale than the gas evolution time.