H I mean lifetime (red line) and theoretical timescales computed for charge-exchange (blue line), H I-p coupling (dotted line), recombination (green line), photo-ionisation (light blue line), collisional ionisation (yellow line), and solar wind expansion (dashed line), as functions of the heliocentric distance for our coronal hole model. The H I mean lifetime and the H I-p coupling time curves overlap each other.