My periods usually last between 5-7 days.
They are at their heaviest in the first two days and then will get pretty light, the last couple of days all I will need is a panty liner.
(Sorry if TMI) I have had blood clots in the past however it has never been something that’s alarmed me.
In regard to the pain. I do get cramps in the first couple of days. I would never miss uni or work it. If it is particularly uncomfortable a paracetamol will usually get it done. The way I would describe the pain is achy, as if I’ve been too hard at the gym. The pains are usually worse when I’m not doing anything, if I was out and about I usually forget.