I calculated the playing time on SuttaCentral Voice (SCV) for English only. The actual playing will certainly deviate: the values SCV gives are estimates only. The actual time will also depend on the narrator (Amy, Raveena, or Russell). Listeners can estimate the time for Pali + English by multiplying by 2.8 (and for Pali only by 1.8). I calculated this multiplier by comparing English and English + Pali time for the Dīgha; for other āgamas the multiplier might be slightly different.
English translations by Bhikkhu Sujato & Bhikkhu Brahmali
Dīgha
Sīlakkhandha Vagga: 7 h and 22 min
Mahā ~: 10 h and 34 min
Pāthika ~: 10 h and 21 min
Total Dīgha (estimate): 1 d, 4 h, and 16 min (the total differs slightly from the sum of the chapters due to rounding).
Majjhima
Root Group of Fifty: 16 h and 15 min
Middle Group of Fifty: 17 h and 4 min
Upper Group of Fifty: 14 h and 36 min
Total Majjhima (estimate): 1 d, 23 h, and 55 min
Saṁyutta
Sagāthā Vaggasaṃyutta: 14 h and 41 min
Nidāna ~: 12 h and 37 min
Khandha ~: 15 h and 3 min
Saḷāyatana ~: 16 h and 42 min
Mahā ~: 18 h and 55 min
Total Saṁyutta (estimate): 3 d, 5 h, and 58 min
Aṅguttara
Book of the Ones: 2 h and 4 min
~ Twos: 2 h and 36 min
~ Threes: 8 h and 37 min
~ Fours: 12 h and 10 min
~ Fives: 10 h and 45 min
~ Sixes: 6 h and 4 min
~ Sevens: 5 h and 20 min
~ Eights: 6 h and 59 min
~ Nines: 3 h and 51 min
~ Elevens: 1 h and 49 min
The audio duration of the Book of Tens is currently unknown. SCV doesn’t seem to index AN 10 properly. The rough preliminary estimate is 8 h and 0 min.
Total Aṅguttara (estimate): 2 d, 20 h, and 15 minutes
Total all four āgamas (estimate): 9 days and 6 hours.
Future Work to Be Done

More reliable estimates. For now, the estimates, which are based on the SC Voice estimates, do not take into account empty segments.
 Other collections when they appear on SCV, first of which the 2019 Therīgāthā and Theragāthā translations.
English Translations by Other Translators
(no data available yet)
Future Work to Be Done
 Translations by Marcus Bingenheimer, Bhikkhu Anālayo, and others, when they appear on SCV.
Translations into Other Languages
(no data available yet)
Future Work to Be Done
 Various translations in other languages.