Estimated backup time for first backup?

i was curious about how long Time Machine will take to backup 107 gigs on the first backup... since its a MacBook i cant leave it on all night or it'll die and if i plug it in it'll reduce battery life

it can take a long time (several hours) so plug it into AC and set the power settings to power adapter and sleep to never. this will not affect your battery and in any even you'll have to live with it.

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