1.25 fl oz (38 ml) in 20-25 sec. (SCAA, US)
1.0-1.25 fl oz in 20-25 sec. (Whole Latte Love, US)
= 1.0-1.5 fl oz in 23-27 sec. (1st-line, US)
1.0 fl oz in 25-30 sec. (generally accepted)
0.75-1.0 fl oz in 22-28 sec. (Coffeeresearch.org, US)
0.85 fl oz (25 ml incl. crema) in 25 sec. ± 2.5 (Istituto Nazionale Espresso Italiano) [mirror]
= 1.0 fl oz (30 ml) in 30 sec. (The 1 ml/sec Rule of Thumb) [mirror]
Ristretto
(Short) 0.75-1.0 fl oz in 25-30 sec. (Schomer)
0.75 fl oz in 27 sec. (CoffeeKid, US)
0.85 fl oz (25 ml) in 30-35 sec. (Al)
Lungo
(Long) 2.0 fl oz (60 ml) in 24 sec. (Al, Anthony R)