MBT (3-methyl-2-butene-1-thiol) happens real quick. People have reported Heineken bottles skunking when in direct sunlight in less than 15 minutes. Heineken has a minor defense of green tinted bottles, clear obviously has less. An hour in an ice bucket outside would most certainly skunk any beer in a green or clear bottle. Since MBT is caused primarily by hops in the beer, the more hops used, the greater the skunking.
In order to prevent skunking, keep all bottles (including brown) out of direct sunlight and fluorescent light. Exposure to incandescent lighting needs to be minimized as well, but it takes longer. If you have old boxes from beer runs, don't throw them out, re-purpose them for keeping your bottles in. A closet or cellar works well to help with preventing exposure as well. If you need to store fermentation vessels, shirts work well, pulled over the top of them.
When transferring from storage to the beer fridge, minimize exposure as well. If green or clear, make sure they're concealed in UV-impenetrable containers from the cellar/closet to the beer fridge.