Back every night on low-costs.
3-4 days apart on tours for shorthaul though sometimes longer.
Between 3 days minimum and 2 weeks maximum for longhaul.
If sent on a course elsewhere could be longer eg simulator at another company's site.
Bear in mind if you set your roots somewhere then occassionally the company can ask you to work from another base - costs of moving are usually provided if above a certain distance from original base and you move within a month or two.