Extended time alone

My wife and I just got our first Maltese - and love him - what a great breed! The problem is, we are now in a situation where we need to leave the nine month old puppy by himself for 8 hours. He is housebroken to go outside (not paper) when we are there, but he doesn't seem to be able to hold it for more than 6 hours during the day - he does sleep through the night though, most of the time. He is locked in the kitchen when we are gone - I didn't think the cage would be wise for such a long time. Will he eventually develop the bladder control to hold it for 8 hours?
Kris Z.

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