How long for stem plants to grow roots?

You should definitely see some roots starting to grow within a couple weeks. Depends on the plant, too. When I was growing Hydrocotyle Leucocephala with good light and Co2, I would periodically trim some of the roots and they would be long and strong again within a week, but that is a quick growing plant to begin with.
 
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i get growth in lest then two days but thats with high light, CO2 and fertz. i would say for a low tech tank you might get them in a week though and it really does mater on youre tank and what type of stem plant.
 
When I first get stem plants, or any plant for that matter, they usually take awhile to settle into the tank. It can take them upwards of 2 weeks before the roots start growing. But, I had some established rotala I cut and within 4 or 5 days they had put down a strong root system, enough to keep them anchored even though the stems were actually above the substrate. That was in a tank with medium/high lighting, co2, ferts.
 
About 2-3 days for me.
 
It will take longer to get a substantial root structure, but I would agree with the time frame of "within a few weeks" initial growth. It really depends on a lot of things...the plant itself, your setup, the condition of the plant, etc.
 
Less than 24 hours for me with Heternanthera zosterifolia and 2 days for Egeria densa. Can't remember about the other stem plants I tried.
 
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