Some sentence examples which use the word 'enlarger'
The first four deal with the mythical history of Genoa from the time of its founder, Janus, the first king of Italy, and its enlarger, a second Janus "citizen of Troy", till its conversion to Christianity "about twenty-five years after the passion of Christ."
Audible beep at the end of each exposure, and optional seconds tick whilst the enlarger is switched on.
Thinking about exposure in terms of seconds is just confusing, think in print tones and let your f-stop enlarger timer do the work !