You still haven't said what delay you require.
If you set the oscillator frequency to 1Hz on a CD4541 and used all of the stages, it would give you a delay of 2^24 seconds or 194 days, 4 hours, 20 miniutes and 16 seconds.
I don't know what the minimum frequency the of the oscillator is but I suppose its possible to get delays of over ten years if you really want.
The only problem is capacitors aren't very accurate, 10% at best, so a calculated ten year delay might be anywhere inbetween 9 and 11 years.