Maximum ethanol concentration for silica gel column chromatography?

I'm unaware if ethanol has the same issues (i kinda doubt it) but you're also not using DCM so probably ok.

Silicycle: Silicycle Biotage: Biotage

In my lab the general knowledge is >10% methanol will dissolve the silica but if you’re needing more polar eluent and are dealing with amine separations(?) I find it useful to use 1% triethylamine or 1%NH4OH solution which reduces the acidity of your silica gel and can help with reducing streaking of your bands

Not so much dissolving, but extensive swelling could cause permanent damage to the column (this depends on packing too)

You’re probably fine up to 100% EtOH as long as you don’t add acid or base.

I was warned about methanol, but I never remember hearing about ethanol dissolving silica. I could be wrong though.

Same as the other comment - I was always told not to use too much methanol.