While you may need space to grow raspberries, you don't need much time. They're also one of the best low-maintenance fruit crops you can grow, with fruiting times ranging from high summer to late autumn.
Summer and autumn croppers
Summer-fruiting varieties crop in July on last year's growth, so when their season finishes cut down the fruiting stems. New shoots will soon emerge, and next year's fruit will be produced on these one-year-old, ripened canes. Autumn varieties fruit on this year's new growth, so cut these back in winter, and they'll generate new wood in spring.
Therefore, to enjoy fresh raspberries from summer right into autumn, grow at least one summer and one autumn variety.