If enough Pas Habaa Bikisnin (e.g. cake or crackers) is eaten at once (according to some opinions as little as four beitzim Mishna Berura 168:24) then the blessing is Hamotzi instead of mezonot.

In what time period must the requisite amount be consumed to qualify? Alternatively, how much must one space out his food to avoid it combining into the requisite amount?

If enough Pas Habaa Bikisnin (e.g. cake or crackers) is eaten at once (according to some opinions as little as four beitzim Mishna Berura 168:24) then the blessing is Hamotzi instead of mezonot.

In what time period must the requisite amount be consumed to qualify? Alternatively, how much must one space out his food to avoid it combining into the requisite amount? If one says Al Hamichya must he still space out his food to avoid combining what is eaten before the bracha with what is eaten after the bracha?

When eating Pas Haba Bikisnin (e.g. cake or crackers), one should preferably not eat a shiur of four beitzim unless he is having bread, because there is a possibility that this amount is already considered the amount that one normally would have for a meal changing the beracha to Hamotzi. (Mishna Berura 168:24).

If one had eaten mezonot and counted the amount of kezaytim that he had consumed, at what point should he restart his count of how much he had eaten?

If enough Pas Habaa Bikisnin (e.g. cake or crackers) is eaten at once (according to some opinions as little as four beitzim Mishna Berura 168:24) then the blessing is Hamotzi instead of mezonot.

In what time period must the requisite amount be consumed to qualify? Alternatively, how much must one space out his food to avoid it combining into the requisite amount?

If one had eaten mezonot and counted the amount of kezaytim that he had consumed, at what point should he restart his count of how much he had eaten?

When eating Pas Haba Bikisnin (e.g. cake or crackers), one should preferably not eat a shiur of four beitzim unless he is having bread, because there is a possibility that this amount is already considered the amount that one normally would have for a meal changing the beracha to Hamotzi. (Mishna Berura 168:24).

If one had eaten mezonot and counted the amount of kezaytim that he had consumed, at what point should he restart his count of how much he had eaten?