I used to check time per craft, for me, it about 100 seconds. ( with using skill)
So.. in 1 hour can do around 36 craft ( 1 hour = 60 min x 60 sec = 3600 sec )
if we got 200 xp per craft, so we got 36x200 = 7200 xp per hour
The last 49->50 need 100,000 xp so = 100,000 / 7200 = 14 hours est. for 200 xp per craft
If you got 300 per craft it will decrease to around 9 hours
400 xp will be around 7 hours.

So... yeah, crafting is the pain in the ass :P