It largely depends on the amp/hour capacity of the battery - the instructions that came with the charger should tell you. As I recall the bike or car setting just limits the maximum charge current so either setting will charge the battery but the bike one will take longer.
As for how long - it depends on how flat the battery is. The Ctek is an intelligent charger and you can leave it connected indefinitely. I re-charged a completely knackered battery (sulphated) with my Ctek and it took several days - but I guess if it is new 24 hours should be more than enough.
Robin
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