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Google failed me on this. I'd like to lengthen my lastlog size in irssi. I know that it's possible, since I've managed to do it years ago. I guess its one of those more esoteric commands?

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Oops, realized it already! It's "/set scrollback_lines". The term "scrollback" didn't come to my mind, so I wouldn't find it from Google. – Drasa Jan 25 '13 at 1:05
Great you found the answer yourself. Would you mind posting it as one, so others having the same problem can find it? – Jens Erat Jan 25 '13 at 1:06
/set scrollback_lines 500

Set history to 500 lines.

/set scrollback_time 1day

Keeps at least one day even if it exceeds the maximum lines.

And here's the settings page for irssi:

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