I have had an Amiga with a 12bps modem connected for 2 weeks, thats about the longest I have had an Amiga on without restart ever. The story is quite funny tho, I went on vacation with my familly for 2 weeks and forgot to turn my Amiga off, the funny thing is that I dident notice untill I got home, back then it was quite expensive to be connected and when I realized that I had been connected for the past 2 weeks I got panic and called my ISP and they saw I had no activity so they did not charge me for it

Then I was happy

But when I used Amiga alot back then it was online for a minimum of 10-12 hours a day for many years

If I remember right I think renderings in Pow Raw on Amiga back then took ages!