It might vary, depending on multimeter.
But if on a multimeter, there is printed "10A for 30sec. MAX every 15 min" or "20A for 15 sec (time unspecified)", below which approximate threshold is the safe duration of measurement indefinite?
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Here's an approximation. The answer is probably too low.
30 sec every 15 min is a 1/30 duty cycle. So assume 10A dissipates 30 times what the meter can handle continuously.
Power dissipated in a resistor is proportional to current squared.
So we would get the same average power with a current of 10 (1 / √30) amps = 1.8A