A simple question;

"If I wanted to get a materialized spirit to carry something 300 miles - would it get tired?"

Since all spirits can fly - it would be a nice straight line as well!

They do have physical stats when manifested, and a stun and physical track. I don't see why they wouldn't follow normal character rules for carrying things. They'd still have to make an STR + BOD test to carry really heavy stuff. I suppose an air spirit could use their telekinesis to make things float and move it that way. At the very least a spirit might get slightly annoyed at having to do something so trivial for a long period of time, but that is GM discretion.

Yeah but I'm thinking they don't need rest. i.e. they could go and carry an item (whether it enclumbers them or not) from A to B without resting regardless of the distance?

Puts an interesting slant on a PC playing a Free Spirit.

They can be bound for one year and day of 24/7 service (guard duty etc). They indeed do not tire out in the same manner as humans.

SYL

Silly answer: Any spirit run over by a car certainly will get tired.

Practical answer: RC, page 91 does state that a free spirit doesn't suffer from having a Street lifestyle and have no need to eat or sleep. Aside from down time for recuperating from taking damage, I'd say spirits are not subject to fatigue at all and can keep going indefinitely.

Problem is, the SR rules represent fatigue as damage.

Now, spirits apparently float magically and don't have to burn energy for moving wings. So my suggestion would be to ignore fatigue from just moving or moving while carrying the standard STRx10 kilos, but everything more requires the normal resistance tests.

Even with the UMT, spirits are still very related to the tradition of the mage so I'd check how the mage's tradition considers the spirits to be.
Besides, a spirit can not FEEL tired, but still pretend that some stuff will leave him tired.

I run it so when materialised they do not get tired.

However free spirits with the meta human form of Animal form power do get fatigue in these forms and need to sleep but can drop to astral and back again fully refreshed and ready to party.

I'm away from books so I can't check, but if fatigue is damage, doesn't hardened armor mitigate it?

If so, that could very well be the source of spirits-not-giving-a-crap about being tired - it only hits them for SERIOUSLY strenous feats.

Fatigue is damage that can't be resisted, so the hardened armour doesn't factor in.