Convert time duration to a human readable string: 5d1h20m30s

prettyTime options

• withSpaces Whether to use spaces to separate times, 1d2h3m5s or 1d 2h 3m 5s, default false
• toFixedVal value pass to toFixed for seconds, default 1
• longFormat Whether to use a long format, default false, 1d2h3m5s or 1days 2hours 3minutes 5seconds