Kalk Drip

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Depends on the size of your tank, and it also depends on whether you are just dripping kalk to supplement alk/Ca, or whether you are using kalk for all your topoff water.

The main concerns if the kalk went in too fast would be a pH spike upwards, and possible precipiation of calcium carbonate.

There is no hard and fast rule for how fast to drip the kalk. If you see no sudden pH spike, and no calcium carbonate precipitation, you should be all right.

For what it's worth my auto-topoff sometimes dumps several cups of kalkwasser into my sump at one time, with no ill effects. Make sure the kalk gets dripped into a high-flow area of the sump, and I don't think the drip rate matters.