Ray,

THE critical question . . . what KIND of Varnish?

If it was a 'long oil' Varnish - SPAR Varnish - the answer is 'Never'. That
stuff is supposed to be 'soft' and flexible.

If something is going to be in contact with the surface {shod feet, hands,
your butt, or a table lamp} you need a 'short oil' varnish.

For interior items, where 'contact use' is expected, I avoid the problem
entirely by applying my usual 6 coats using a water-based poly. If the
'traditional Amber' tone is desired, I'll do it with a prior light staining,
or add drops of dye to the poly until I reach the tone I want.

I do use 'short oil' varnish for interior work - where UV exposure
protection is required.

Regards & Good Luck,
Ron Magen
Backyard Boatshop

"RayV" wrote ..
The end tables I made for SWMBO are Maple stained with H2O-based stain
and covered with Varnish.

I applied the Varnish thinned 2:1 with Mineral Spirits by wiping with
a rag.
SNIP
So now I have 8 coats all applied with at least 24 hours in between.
SNIP
How long does this stuff take to cure?