Extremely long proccessing PRES CONNECT WORKFLOW

This log shows that one step took extremely long:

INFO : 20:38:50.687 [0015] Source is Data mapping configuration: EM de Jong - Sligro - CHES - eind.OL-datamapper.
INFO : 20:38:50.825 [0015] Template: EM de Jong - Sligro - CHES - stap1.OL-template.
INFO : 20:38:50.827 [0015] Output preset: CHES - 24UP.OL-outputpreset.
INFO : 02:47:10.707 [0015] Output created and stored in file “vger17DB335.dat”
INFO : 02:47:10.711 [0015] Plugin All in One completed successfully - 02:47:10 (elapsed time: 06:08:20.129)

an other instant:

INFO : 13:52:38.114 [0015] Source is Data mapping configuration: EM de Jong - Sligro - CHES - eind.OL-datamapper.
INFO : 13:52:38.410 [0015] Template: EM de Jong - Sligro - CHES - stap1.OL-template.
INFO : 13:52:38.469 [0015] Output preset: CHES - 24UP.OL-outputpreset.
INFO : 19:28:46.024 [0015] Output created and stored in file “vger9D13E.dat”
INFO : 19:28:46.029 [0015] Plugin All in One completed successfully - 19:28:46 (elapsed time: 05:36:08.050)

But normally, it only takes about a few minutes:

INFO : 10:57:50.243 [0015] Source is Data mapping configuration: EM de Jong - Sligro - CHES - eind.OL-datamapper.
INFO : 10:57:50.282 [0015] Template: EM de Jong - Sligro - CHES - stap1.OL-template.
INFO : 10:57:50.285 [0015] Output preset: CHES - 24UP.OL-outputpreset.
INFO : 10:59:16.543 [0015] Output created and stored in file “vger57B2ED.dat”
INFO : 10:59:16.547 [0015] Plugin All in One completed successfully - 10:59:16 (elapsed time: 00:01:26.407)

Help..?

Whats is different for each instance?

Data file length?
Data file content?
Dynamic images called?
Workfload at that time on the server?