Drosophila melanogaster eclosion
Although I found this study, where mean and 95% CIs of median time to
eclosion (h) are provided for some strains of D.m. (with a resolution of 12 h) (in table 3), the moment of eclosion seems to be under circadian control: "in Drosophila melanogaster, the emergence of adults from their pupal cases (eclosion) is gated by the circadian clock such that it occurs during a window of approximately 8-10 h starting 1-2 h before lights-on in 12-h light:12-h dark cycles (LD)". In that particular study Canton-S flies eclosed within 4-5 days after pupation (LD 12:12, 25°C) with the following distribution over day (digitized from Fig. 1A [numbers are approximate, percents don't sum up to 100]):

Hours   % eclosed
Dark
12-14   0.5
14-16   0.4
16-18   0.6
18-20   1.1
20-22   1.4
22-24   5.6

Light
0-1     20.4
1-2     9.3
2-3     13.7
3-4     12.0
4-5     10.3
5-6     11.3
6-7     6.6
7-8     4.9
8-9     2.1
9-10    0.8
10-11   0.8
11-12   0.4