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Not much time at all! For most of the time, you will just have to water your plant, so that would be about 5 min every 2 or 3 days. On some occasions, when you give the plant a bigger pot or collect data for the project, it will be around 1h, but this will only be necessary 5-7 times in ca. 6 months. No worries! Most of the project ist done by letting your plant grow by itself. I will also give detailed instructions on this, so even if you have not touched a plant in your life , it is no problem! So, as a rough estimation:

Plant grow time, for one season ca. 6 months = 26 weeks. Watering every 2,5 days for 5 min means watering roughly 73 times, which equals to just about 6 hours. If you repot twice (2h) and collect data 5 times (5h), we have 6h+2h+5h= 13h of work in total! So as a weekly average, that would mean roughly 30 min per week, or just about 4,28 min a day! :)

But as I said, the watering will feel like no work at all and the plant care and data collection occurs only 7 times (2x plant care, 5 times data collection).

I hope I could answer your question!

Cool thank you for your answer :)