I think there will never be a 'truly perfect' time to ctb, if you're worrying about the impact on your loved ones. Except maybe if everyone of those people accepts and supports your choice (or rather your lack of a choice) -- but for most people on here, that will never happen.
That's an inherent problem of suicide: the fact that you have to choose to do it, automatically brings all kinds of worries attached to this choice. 'Natural death' just comes, no one can/will blame you for the unfortunate time of your death or the fact that you died (if at all, they could only blame the universe, god or fate).
And it's the underlying reason for many discussions on here and why so many people wish they'd just not wake up tomorrow or die in an accident, they don't want to make that choice.
And you alone have to make it, because again, most people won't have full support in this decision from their family/friends. (I don't blame the latter ones. Especially if there's no 'truly' terminal illness involved, there will always be hope in some way, may it be irrational, and that creates some kind of dilemma which they can't/don't want to resolve)
But if you have decided that there's no other way and know all that, you can use it to free yourself from this worry about the perfect time and just choose a 'good enough' time
(sorry, much longer than I wanted it to be
this topic just was on my mind lately..)