How much experience for hatching a Solstice Dragon

Generally they will breed a child of the same exact type, at least 95% of the time in my experience. However they can breed a hybrid of their elements.

When breeding two Chrome dragons (air/metal) repeatedly I found that once I got a Rust dragon (Metal+water)! This is because, apparently, on rare occasion an Air dragon breeds as a fire or water dragon instead of an air dragon.

From the Dragonvale Wiki entry on Solstice Dragon:

The Solstice Dragon can be bred by selecting an Earth or earth hybrid dragon to mate with a Blazing Dragon at the Breeding Cave/Epic Breeding Island.

Solstice Dragon may also be bred using Sun and Solstice Dragon which has roughly a 50% chance of the result being a Solstice Dragon.

The breeding time for a Solstice Dragon is 23.5 hours. Note you'll need a Sun habitat to hatch one, they are Sun elemental. According to the Dragonvale Facebook pageThey will remain until June 27. It's suggested by BackFlip that it's easier to get one during the day of the solstice (that's June 20th for the summer solstice). It will keep returning during the winter and summer solstices.

Note that the Sun/Solstice pairing has a higher chance of getting you a Solstice Dragon, but the breeding times will be much longer for failures. Also, due to the requirements of a Blazing Dragon, you'll need to be level 14 in order to breed the prerequisite dragons.