In basic D&D, how long does it take to do an action such as listening to a door, searching for traps, open a door, pickpocket? A whole turn? A round? Because 10 minutes is a bit long.
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As with most of Moldvay common sense applies. Let's look at the time section of the rules (which okeefe has provided):
You can apply common sense to most of these. Have you listened at a door or seen someone do it in a movie or TV? How long did it take? I'd do things in units of minutes for ease of figuring a turn so I'd say one minute.
Opening a door is fairly instantaneous. Having to batter a door down is similar to combat so each bash would be one combat round in my estimation.
Searching for traps would arguably exploring and in fact if you read the time entry "for a thief to check an item for traps" is explicitly noted. In fact, if I was risking life or death on a poison needle ten minutes does not seem too long.
So, the key idea is apply common sense and your experience. Yes, D&D presents a fantastic environment but you're still playing essentially a human (yes, even if you're a dwarf) doing human scale things most of the time. Just decide, based on experience, that it takes X minutes and keep a running total of minutes to get turns.
Finally, the idea of turns is an organizing factor for the GM's convenience more that a boardgame type formal structure. Turns govern movement, resources, and wandering monsters. I speak to my players in terms of "that takes about 5 minutes" or "that'll take a minute" and keep track of minutes adding up to turns behind the screen.
These listed actions take a turn, and other actions are at the DM's discretion. A turn is probably a good default.