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You want twice the depth of soil above the bub as the bulb is tall. That is, if a daff bulb is 5cm tall, dig a hole 15cm deep and place the bulb at the bottom which will then have 10cm of soil above it when you fill the hole in.
Totally depends on the size of bulb peter, and they can vary enormously. Four inches or so will suit smaller daffs, but would be too deep for crocus, and too shallow for most lilies for instance. Bob's description is the way to go - you won't go far wrong if you follow that.
In pots you can plant more closely together, and also less deep as it's a different medium altogether, and many people feel tulips will perform and survive better if they're planted more deeply than the recommended 'twice the height' system
How do you prevent mice getting at them, someone suggested covering in chilli powder, but not convinced?