Dave, in previous roles, this has provent difficult to manage. Typically on older sites where you are stuck with the layout I have found that there is a variety of distances that a FLT has to cover.

Where possible I have limited this, from unloading bay to goods in - always try ot make this as short as possible as the FLT drivers are usually under pressure to get the truck unloaded.

In one instance due to very tall pallets being delivered over a period of weeks, I had the FLT operators rotate jobs - from goods in to put-aways during their shifts.

Newer sites I have managed where the layout hsa been thought about - these usually cater for shorter runs from unloading to goods in.

Reasonable / maximum distance is dificult to quantify, however, as mentioned above when considered excessive - or where other factors (time, pressure to get job done etc) exist I have implemented job rotation.

Also worth noting, as will all individuals, we have things we like and things we don't - one shift of FLT drivers half liked goods in, half liked put-aways, so although I gave them the option they stuck to what they liked.