On a daily basis? Less than one I′d say. I remember when Lothran was low-level and got beaten by one of them just outside the Imperial City walls. He was just about to kill it while at the same time healing himself, unfortunately he didn′t have the time to do both so... Luckily he was strong enough to get back from the Aetherius plane, a perfect reason to name his horse after that place. Thanks to Buffy for reminding him of it
Nowadays the only trolls that stand a chance against him ( no they don′t really
) are the Azhklan trolls.