If you post your photo gallery in flicker their is no limit in time frame since it is design to share photo multiple. Flicker is free for 1 Tera .Meanwhile the facebook if you constantly post photo every minutes your account will be block since you are sharing in across in social media. To much posting in a minutes is not advisable in facebook. Facebook photo gallery is very fast uploading and can contain 1000 photos in each album. Facebook has unlimited posting of photos.