That 2 weeks is excessive by any consideration.
It varies bike to bike, but some bikes can stand for many months or more..
If it truly was only 2 weeks since it was ridden, if that was my bike I'd be tempted to take the timing cover off and see
1. That the conical rubber oil seal on the oil pump is in good order, and correctly located.
If its not, it can lead to no oil going into the crank - which is not good. AT ALL. And also cause excessive wet sumping
(which is the least of your worries in this scenario)).
2. That the oil pump is actually in there !!
details removing the oil pump and flatting down the end plates on that oil pump.
Which for me has greatly reduced the sumping tendencies of my Nortons.
I've not met a leakage rate like that though.
I'd also comment that that quantity of oil you drained out is more than should be in the tank ?
It sounds like someone found the level in the oil tank was low, and topped it up again.
Without checking how much had gone down into the sump.
However, if your container under it doesn't indicate an excessive leakage, maybe you could refit the sump plug,
ensure the oil tank is filled to the mark on the dipstick, and gently start it.
If it all sounds happy (and well oiled) it just might be good to go.
Act wisely !?