Table 2.

Real-world scheduling results for each instance before and during COVID-19

	Pre corona			Corona
	Travel $+$ wait	Overtime	Objective	Travel $+$ wait	Overtime	Objective	Increase
	(min)	(min)	(min)	(min)	(min)	(min)	(%)
$I_1$	1730	231	1961	1957	294	2251	14.8
$I_2$	1937	164	2101	1989	299	2288	8.9
$I_3$	1838	1320	3158	1887	1321	3208	1.6
$I_4$	1231	701	1932	1325	808	2133	10.4
$I_5$	1400	222	1622	1438	282	1720	6.0
$I_6$	1276	323	1599	1299	328	1627	1.8
$I_7$	2033	564	2597	2423	643	3066	18.1
$I_8$	1344	2751	4095	1383	2772	4155	1.5
$I_9$	1292	3632	4924	1340	3684	5024	2.0
$I_{10}$	1340	1291	2631	1461	1333	2794	6.2
$I_{11}$	1851	880	2731	1882	932	2814	3.0
$I_{12}$	1747	2883	4630	1817	2960	4777	3.2
$I_{13}$	1159	1326	2485	1227	1392	2619	5.4
$I_{14}$	1854	429	2283	1886	442	2328	2.0
$I_{15}$	1739	230	1969	1839	369	2208	12.1
$I_{16}$	1360	364	1724	1429	438	1867	8.3
Mean	1571	1082	2653	1661	1144	2805	6.6