Battery empty – recharge? Just starting aid? How much km to recharge necessary?

Moin, somehow I made it now. My battery is all ;(. Fzg: 850er 2.5, petroler, BJ. 96. Nothing works anymore, so neither ZV nor indoor light. If I get start help (by second car), how many km do I have to drive about, so that the battery gets enough juice for the next start? Do not have a garage for the car at the moment. Where could I charge the battery? Thanks!