Another way
Formula: copy to clipboard
=SUMPRODUCT(--TRIM(MID(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE($A1," mins","")," hrs ","^")," days ","^"),"^",REPT(" ",256)),(ROW($1:$3)-1)*256+1,256)),{1440;60;1})


One other way ... array entered ...
Formula: copy to clipboard
=SUM(MID(A1,SMALL(IF(MID(" "&A1,ROW(INDIRECT("1:"&LEN(" "&A1))),1)=" ",ROW(INDIRECT("1:"&LEN(" "&A1)))),{1,3,5}),2)*{1440,60,1})



A
B
C
D
1
1 days 15 hrs 49 mins
2389
2389
2
1 days 16 hrs 0 mins
2400
2400
3
1 days 19 hrs 30 mins
2610
2610
4
2 days 15 hrs 15 mins
3795
3795
5
2 days 20 hrs 43 mins
4123
4123
6
4 days 21 hrs 24 mins
7044
7044
7
6 days 7 hrs 21 mins
9081
9081
8
11 days 4 hrs 26 mins
16106
16106
9
18 days 0 hrs 19 mins
25939
25939
10
19 days 3 hrs 5 mins
27545
27545
11
28 days 7 hrs 28 mins
40768
40768
12
29 days 2 hrs 28 mins
41908
41908
13
31 days 8 hrs 34 mins
45154
45154
14
53 days 12 hrs 15 mins
77055
77055