How to avoid hanging wget in bash -

i have .sh script that, among other things, wgets currency exchange rates google follows:

printf 'bash: going exchange rates' echo     wget -qo- "http://www.google.com/finance/converter?a=1&from=usd&to=aud" |  sed '/res/!d;s/<[^>]*>//g' > exrates wget -qo- "http://www.google.com/finance/converter?a=1&from=usd&to=jpy" |  sed '/res/!d;s/<[^>]*>//g' >> exrates wget -qo- "http://www.google.com/finance/converter?a=1&from=usd&to=hkd" |  sed '/res/!d;s/<[^>]*>//g' >> exrates wget -qo- "http://www.google.com/finance/converter?a=1&from=usd&to=nzd" |  sed '/res/!d;s/<[^>]*>//g' >> exrates wget -qo- "http://www.google.com/finance/converter?a=1&from=usd&to=eur" |  sed '/res/!d;s/<[^>]*>//g' >> exrates wget -qo- "http://www.google.com/finance/converter?a=1&from=usd&to=gbp" |  sed '/res/!d;s/<[^>]*>//g' >> exrates  mv /home/stan/perl/2014/scripts/exrates /home/stan/perl/2014/exrates/exrates  printf 'bash: got exchange rates' echo 

occasionally script hangs here, however. don't mind not updating these rates every time runs, if hangs i'd skip step altogether, how?

what should put in "if" statement check if wget can fetch data promptly or take forever? little more verbosity in wget execution wouldn't hurt either.

btw, don't know why wget hangs. browser opens pages okay, , same commands run terminal line line work, too.

i assume hangs because have number of http requests being sent single host in script. host in question doesn't , starts block requests ip address.

a simple workaround put sleep in between requests. make use of function:

getexchangerates() {   wget -qo- "http://www.google.com/finance/converter?a=1&from=usd&to=$1" |  sed '/res/!d;s/<[^>]*>//g' >> exrates   sleep 10   # adding 10 second sleep } 

and invoke passing parameter function:

getexchangerates aud 

the function invoked in loop various currencies:

for currency in aud jpy hkd nzd eur gpb;   getexchangerates $currency done