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The wall tiles are not glued, not even the roof.
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With 107 glue is to prevent it from coming off.
Putty for exterior walls is composed of stone powder, white cement, redispersible latex powder, water retention agent, etc. Therefore, it is okay to add some exterior wall putty powder to the mortar to adjust and workability, but the amount of cement in the mortar is 10%.
Stick the floor tiles first, the kitchen is a more humid space, first paste the floor tiles and then press the floor tiles with the wall tiles to avoid the emergence of water flowing out with the gaps in the floor tiles and breeding bacteria.
30-60 varies from one square to another, depending on the area and the skill of the worker.
Look at the empty is not bad, yes, as long as the large area of the brick is pasted solid, there is no problem, the four corners are a little empty is normal, if you say that your entire brick is solid, to the contrary is not very good, if the wall is a little deformed, it will crack the tile!
It doesn't matter what happens, you can't see the cabinet in the future, and it won't affect the appearance.