how to translate "wondering if it will end"

[mens sparsa]

Is something like "si desiturum esse mirans" ok. I'm not quite sure if mirans has the correct meaning in this context.

[adrianus]

"si desiturum esse mirans" is wrong, I would say. Falsum est, ut opinor.

Is something like "si desiturum esse mirans" ok. I'm not quite sure if mirans has the correct meaning in this context.

Verò, ego equidem optimum istius loquendi modum ignoro at hoc conjecto:
I, for one, don't really know the best way to say it but maybe this:

"...hoc demirans, si id desiturum sit"