for an e-mail or  return call  should be as soon as possible  on both sides... I always get amazed when I hear back after a quick response from me  how  thankful  they are that I was so quick to return a call or e-mail ......I think most are use to providers  taking their sweet time to call or write back .....so  like any business you snooze you lose ......another pet peeve  I hear is the full VIM  mailbox   that too  drives me crazy when I cannot get to a provider  myself  .....common sense  go's a long way....  customer service and a good work ethic applies  in this business also another tip  check  your Pm's daily it take less than a minute to do......and can bring you many appointments  engaging  with potential clients helps them feel a connection with you......I spend every morning responding to each potential client and pm's daily are checked