total retention time

in chromatography
symbol: $t_{\rm{R}}$
https://doi.org/10.1351/goldbook.10039
Time between sample injection and the emergence of the peak maximum of the sample component of interest.
Notes:
  1. Total retention time includes the hold-up time.
  2. The total retention time is related to the total retention volume (\(V_{\rm{R}}\)) and flow rate (\(F_{\rm{c}}\)) by \(t_{\rm{R}} = V_{\rm{R}}⁄F_{\rm{c}}\) .
Source:
PAC, 2017, 90, 181. 'Terminology of separation methods (IUPAC Recommendations 2017)' on page 199 (https://doi.org/10.1515/pac-2017-0111)