To keep with the 'going to the shops to buy milk' theme you can break it down into bits you can estimate. Assuming you've never bought milk before: - how long

To keep with the 'going to the shops to buy milk' theme you can break it down into bits you can estimate. Assuming you've never bought milk before: - how long will research take? Where do you buy milk? Where is the nearest shop? 3 mins. - how long to get to nearest shop and back (eg 10mins x 2) = 20 mins. - find milk in shop (30 secs to 5 minutes), so say 4 mins. - Buy milk. (1 to 5) say 3 mins. Don't forget that these are estimates and always add a bit of headroom. The above comes to 31 mins, so say 35 and you know you're covered. If the manager isn't happy with it, give him the low down figures.