[DVD-o-matic] 51 hours remaining; 0.1 pictures per second ?

Hello... Just wondering cause it seems to me longer than usual but it's also first time I work from en "entire" dvd... The whole feature is 1h 15 min long made of 5 VOB files. I've started encoding monday the 4th, at 5:30 pm. DCP-o-matic now says 84%: 41 hours remaining; 0.1 pictures per second... Computer is AMD Phenom(tm) II X4 955 Processor × 4 with 7,8 Gio Ram running Ubuntu 12.04. We are Friday, Nov 8th, 4:45 pm. Should I worry ? Best regards, Gérald