One of my girls went with no "test holes" and just straight into egg laying in the first hole. It took maybe 4 hours, possibly less. I came home from work and she was digging. I set up my little security camera and by lights out she was asleep on her branch.
One of my other girls has 2 lay bin plants. She digs in both, knocking soil and sand all over - she'll even dig in the stuff she knocks out sometimes! She is closer to the "commonly described" process - will stop eating, dig many holes and watch them, dig all day etc.
My WC took about a week or more. She dug MANY times... even filling in the hole then digging it right back up! At no point did she entirely refuse foods (free ranged feeders). She also had 2 lay areas in her cage but wouldn't touch the sandy mix. She also tended to dig more shallow holes and be quicker about doing so, which I found interesting.
So within my little cham community, no two are the same. Most of my girls have laid more than once and even those may be similar but never quite the same. I'd say so long as shes digging and trying to lay and being active, shes working it out...
Best wishes!