About half of the extract is a general rule of thumb. Half goes in when you reach boil temps. Start hopping when you get back to boil. Add the remaining extract with 15 minutes remaining. You'll find that even if you can only boil 2 gallons, using the late extract process allows you to top up to 5 gallons. At a 2.5 gallon batch, 2 gallons is almost a full boil.
Put your topoff water in the fridge overnight, then in the freezer a half hour before you're done brewing. It shouldn't be frozen, but it will be cold and help chill your wort quickly.
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