Lvl 5 Wizards are awesome and are always a great donation. Wb's... ehhh... most of the time if you're carrying a lot for a certain attack, only half of them do most of the damage needed. The rest are killed off or decoys.
Upgrading wallbreakers would make sense. They are a necessity.
You were asking how many gems it would cost to skip the time? On this page is a calculator for gem costs http://clashofclans.wikia.com/wiki/Gems 5 days comes out to 753 gems.
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