Apologies if this is a silly question, but I'm pretty new to this.

I've got a Jobo C6600 Enlarger and colour head. It works fine when printing on multigrade paper, except that the exposure times when using filtered light compared to full white light seem much longer.
What is a normal time for printing using a colour head at, say, a grade two filter?
I got my values from here , do they look correct?

I've only just started to print my own pictures in the Darkroom so simplification is appreicated