I have a Arctic/Timber/Malamute x. Amazing dog, very difficult at times, but just so smart. This is "Trinity". She stands as tall as me on her back legs.
Here she is wondering wtf I am doing
With her buddy at our cabin
About maintenance, she gets a min of 2 walks a day. Usually one is cycling (I have a modified walky-dog I use on my bike) or jogging (use a harness and skijoring gear to jog with her).
She's calmed down a lot now but growing up has caused thousands of dollars in damage, she could not be left alone, even with a table, she'd eat the table if it was chewable. She's chewed remotes, video cameras, planters, digs "dens" in the back yard, can't be let off leash in public areas (she won't come back, no it is not a training issue. She likes to play games and won't come unless she wants to).
Its much better now though, only the odd chewing incident usually if she feels ignored and wants some negative attention, kinda like a kid.