How much time do INS1-E and MIN6 cells need after splitting?

I am currently doing an experiment on cells to test the internalization of a protein.
Normally, I seeded my cells the day before the incubation. This worked well for Hela, CHL or PANC1 cells. However, when I did the same with INS1-E and MIN6 (both beta-cells) after the incubation and the washing step the majority of the cells were gone. This was better in the control where I did not put in the compound, but still a lot of cells were detached.

Therefore, I wonder if I should seed the INS1-E and MIN6 cells earlier, more like 2-3 days before. Do these cell lines need more time after splitting to attach again?