Interval conversion

While my main pool is closed for 3 weeks of maintenance I am swimming at the local health club pool. My main pool is 25 meters, and the replacement is 25 yards. I hadn't swum yards in years, and I was surprised to find that yards feel substantially shorter (at least until I hit the reverse order IM sets yesterday -- those last fly legs were brutal, even though I dogged the other 3 strokes knowing it was coming. :) But I digress) I haven't been too worried about holding intervals up to this point, which is about 8 months back into the pool and swimming. I swim alone, and I had the handy excuse that the intervals were written for yards, so I blew them off. But I think it is time to start thinking about hitting some. Whis is a long winded way of getting to my question, which is what is the adjustment factor for intervals from yards to meters? I seem to recall seeing 10% somewhere. Is it really that much? 7 seconds on a 1:10, for example? And the replacement pool, with short lengths, one lap lane, warm, cloudy water and warmer air dense with chlorine, no gutters, and shallow ends really makes me appreciate my other pool. Can't wait for it to re-open.
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