This is accomplished by invoking a switch within the ping command. If your pings are not returning to you, try increasing this number to 750 or higher if necessary. Ping speeds will often average 150 - 375 ms depending on your type of connection. If you're seeing times in excess of 800 ms, something is probably amiss with the connection. If this is the case, using tracert will help isolate the offending nod.
Bytes is an indication of the packet size.
Time is how long the round trip took in milliseconds and TTL is Time To Live. TTL is a number between 0 and 254 which is assigned to the packet. Each nod, server or router along the way reduces this number by one. If the packet number gets to zero before it reaches it's destination it is discarded. This prevents lost packets from roaming the internet indefinitely.