Bumblebees will travel long distances to forage, with some species able to travel further than others. Bumblebees require a continuous source of pollen and nectar throughout the length of the colony. If this is not available locally, they have the capacity to travel further to find flowering sources however this has costs in terms of energy expended. For example the duration of a foraging trip for smaller bees e.g. Early bumblebee and Shrill carder bee generally take 20 mins or less whereas for the larger bees e.g. White-tailed and Buff-tailed bumblebees is over 50 mins. Therefore as habitats become more fragmented the species with smaller foraging ranges may be impacted more.

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https://www.bbc.co.uk/news/science-environment-39279941