I'm working on my second novel so I won't be posting for a while (not even to MAT).
I don't know how long a while is, and I won't know until I get there, but the SOED says:
and, a little less obliquely:
A period of time, considered with respect to its duration.
So that's what I'll be doing (not, please note, whiling away the time which implies that nothing will have been achieved by the time the whiling ends). And that's why I won't be posting for some while.
The time spent (connoting trouble, effort or work) in doing something.