Let's eat three loaves a, b and c.

, each surface is a 1, a2, b 1, b2, c 1, c2.

In order to minimize the time, bake both sides every minute, not both sides at the same time. So: the first minute: a 1, b1; Second minute: a2, c1; Minute 3: b2, c2. It will take at least three minutes.

Extended data

It will take at least 7 minutes.

Toast bread, both sides should be baked, two minutes for the front and one minute for the back, and only two can be baked at the same time.

If you need to bake five loaves of bread, you can put two loaves in first.

It takes 2+ 1=3 minutes,

The last three breads are numbered a, b and c,

At the beginning, you can put two pieces of bread, A and B,

After 2 minutes, you can flip B, take out A and put in C,

1 min, you can take out B, then put the reverse side of A, 1 min, take out A, flip C,

C can be taken out 1 minute, and all three breads are baked.

Then it takes at least 2+ 1+ 1=4 (minutes) to bake three loaves.

Then it takes at least 3+4=7 (minutes) to bake five loaves.

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