I ordered 2 supps that contain Magnesium

Potassium & Magnesium 40mg
Calcium Magnesium & Zinc 400mg

1st question....is that too much daily magnesium (will it kill me?)
2nd question...I've been eeeeem "whooshing" ALL day long (NOT complaining, because I was home all day) but how long does it take for your body get "used" to it....(the urgency factor)

Thank you for any comments