From what I understand and read, the bottles are fine to use for 24hrs as long as they've been 'put together' and the lid on properly as this makes them airtight. Steam sterilisers only keep them sterile for 'x' amount of time (mine is 6hrs) as they have holes in the lids and therefore air can get to the parts.
I used to sterilize and put together about 3/4 at a time, so thats about 12 hours or so, do that on a morning and then a batch before bed for through the night.
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