[Mihai]

Yeah, that would be a great option to have.....

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[fluxpie]

why impossible? Fprime for lightwave has this kind of feature, you have to save along some rather big files with every frame but it works

[rivoli]

after a four hour render, it would be nice to just press a boutton to continue with the present solution

yes, it definetely would.
this is just a few threads below yours:

http://www.maxwellrender.com/forum/viewtopic.php?t=2122

[Tyrone Marshall]

after a four hour render, it would be nice to just press a boutton to continue with the present solution, rather than generate a completely new one, wasting the last four hours

There is already a continue render feature in the standalone. I would say that at the moment all renders should be expected to go for a good 3, 5, 8, 12, and 40 hours to clear noise in different situations and using a noise reduction tools afterwards.

So if you are doing an exterior render, I would be looking at 5, 12, and 24 hours for the render time, so just use the built in command option feature to extend your render if after one of these intervals or one that you choose is not enough you can just continue from that last render time.