When growing leaks how long until harvest and any tips?

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Answers:
Leeks take a long time. Plant in the spring, and usually in fall they're getting to harvest-able size. Full sun.

If you didn't plant them in a depression, go mound them up as they grow - it will get you more of the tender white part, and less green. (planting them in a depression in the ground just makes it easier to mound the soil up around them as they grow). The green has flavor too, but it's fibrous and tough - I'll use the greens to flavor stocks, but you really can't eat 'em unless you're a cow. (Or you use just the tenderest tips, and slice them tiny, and add to a saute).

I like the white stems at least an inch thick when I harvest.

You can also winter them over. Much up with some leaves. The tops will die back a bit - though not completely, and the plants will continue growing again in the spring. Harvest in the spring, and let one go. it'll put up a big white allium flower. That fall or late summer, you'll have more seeds from that one flower than you'll know what to do with. You'll be able to grow leeks for years.