I think I have Mg deficiency and started spraying with Epsom salt solution. The yellow leaves are still appearing, getting closer to the top. How long does it typically take to see improvement?
It took my plant about 3 days. The leaves that got too yellow or had burnt spots most likely won't fully recover though and your plant may want to use their nutrients and drop them. But do not worry, as long as it is just some true leaves, your plant will be perfectly fine with it.
Please make sure your ph is within the right range for the grow stage your plant is in as it can be the reason of the deficiency!