Everest Base Camp elevation is 17,600 feet (or 5,380m) but  considering it takes 8 days to reach that altitude from 2845m or  9,383 feet (or 2,845m) it is quite an altitude gain. Climbers also have the chance to climb Kala Patthar for sunrise or sunset view and can go as high as 18,514 feet (5,659m)                    

In general if you are happy walking for 5to 6 hrs a day with a light day pack then you should be fine so long as you are fit in advance. Trekkers should be comfortable with occasional rough terrain, but expect long steep climbs. Some days could include ascents and descents of 500 metres or more. Most walking is done in the morning and afternoons are for relaxing. One thing you can’t train for is altitude and that can prevent people reaching base camp where there is 50% less oxygen compared to sea level. The secret is to acclimatise well and to do so you need to take a slow pace, a good itinerary, ascend to altitude slowly, rest, eat good food, sleep well and drink plenty of fluids.

The trek takes 14 days from Kathmandu to Kathmandu if you fly into and out of the mountain airstrip of Lukla and take the normal route to base camp. You should allow 2 or 3  days on top of this for travel days to reach Kathmandu and to get over jet lag and to explore the city. There are other Everest Base Camp route options for the trek such as Jiri, Saleri and Phaplu which are all beautiful, less travelled and take longer.

This is a really difficult one to answer directly - "how will I cope with the altitude". To be honest, this is an ' unknown' factor as no-one can predict how your body will cope at altitude. People who have been to altitude many times in the past without problems, may on one climb suddenly develop problems. There are many factors that play a role. The only way to help combat this, is to take all of the necessary precautions, and walk slowly.                  

The flights to Lukla have a limit of 10 kilograms per person of checked luggage and 5 kilograms per person in hand luggage.  They weigh all bags and will charge you if your bags are overweight.