You start the timer every takeoff since you don’t know if you going to have engine failure, just a good practice.
And the 5/10 min limitation is 5 for both engines 10 for one engine.
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Isn’t that obvious?
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Cool! Is this one of the reasons why Airbuses taxi so slow after landing sometimes?
Really? they do? Don’t they all taxi at the same speed?
I’m not aware of this fact. You usually taxi as fast/slow as the aircraft wants to go at idle thrust.
That said, the slower you taxi and the lower the idle RPM of the engine, the higher the ITT.
@Neo4316 They don’t taxi at the same speed. See above.
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No I mean, don’t airports have restrictions that you have to taxi on certain speeds under normal conditions, so that you don’t cause an accident or cause a traffic congestions on the taxiway?
No there isn’t such a restriction. Usually you don’t exceed ~20kts, but that’s it.
After landing the weight is usually rather low, so after accelerating to e.g. 15 or 20kts and reducing thrust to idle, the aircraft will tend to keep its speed.
If you are taxiing too slow for ATCs liking, they let you know.
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Ah, here it gets a bit complicated. Yes, there is no restriction worldwide. But for example in Germany in the specific airport usage rules there can be a speed limit. Also airlines can set a company speed limit for taxiing as well.
Not complicated at all. If you don’t exceed 20kts you are fine.
Do you have a link for the restrictions in Germany?
Just checked the FRA charts and couldn’t find one.
It is a maximum limit. Not a minimum. I have it from the German Wiki entry. ( Rollen (Luftverkehr) – Wikipedia )
I have never seen this either and I have flown in and out of a lot of airports in Germany. Anyway company I fly for, max. taxi speed in turns = 10 kts, straight taxiways = 20 kts for long straight taxiways, 30 kts is allowed even.
Again, at 20kts you are fine everywhere. As @anon50268670 mentioned, the company limits are basically the same.
@anon50268670 Same in the companies I worked for, plus a 5kts limit for the final turn to parking.
@flightXtreme418 thanx for the link 
Just checked and at least at the big airports like CGN, FRA and MUC there aren’t restrictions.
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I have to look it up, its not like I’m relying on the groundspeed readout anyway when turning, but I believe 10 kts is for turns exceeding 45 degrees or something.
Edit: “Normal taxi speed is approximately 20 kts, adjusted for conditions. On long straight taxi routes, speeds up to 30 kts are acceptable, however at speeds greater than 20 kts use caution when using the nose wheel steering to avoid over controlling. When approaching a turn, speed should be reduced, primarily by reducing thrust, to an appropriate speed for conditions. On a dry surface, use approximately 10 kts for turn angles greater than those typically required for high speed runway turnoffs.”
Oh, I don’t want to make trouble. I only heard from it here and there and just wanted a quick check. I don’t say it is common or whatever. 
And yes, it is not a german wide rule. ^^
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So its not for keeping track of when I should have my next cup of tea, or to check the timeliness of the cabin crew between when I order it and when it is delivered?
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