Batch Sparge Newbie Q&A

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Folks

Putting togehter my AG kit i have a question on what size coolbox to buy.

If ive 27 Litres of water in my HLQ would it be feasable to batch sparge the entire volume if i have a 32 litre coolbox? Woud i leave it 1 1/2 hours or more?

I noticed most tend to do it twice is that just because of the need to split the volume.

Not long now, missed out on 27 litre 3Kw Burco boiler last night on ebay probably to one of my colleagues on here so hey ho what can i do... Ill keep looking but looking forward to putting together batch sparge coolbox etc as this excellent link viewtopic.php?f=6&t=17728

Thanks in advance.